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31-465: Prices in the Tanzanian shilling are written in the form of x/y , where x is the amount above 1 shilling, while y is the amount in cents. An equals sign or hyphen represents zero amount. For example, 50 cents is written as "-/ 50 " and 100 shillings as "100/ = " or "100/-". Sometimes the abbreviation TSh is prefixed for distinction. If the amount is written using words as well as numerals, only

62-537: A congruence relation in modular arithmetic . Also, in chemistry , the triple bar can be used to represent a triple bond between atoms. The symbol ≅ is often used to indicate isomorphic algebraic structures or congruent geometric figures. Equality of truth values (through bi-implication or logical equivalence ), may be denoted by various symbols including = , ~ , and ⇔ . Additional precomposed symbols with code points in Unicode for notations related to

93-444: A relational operator that tested for equality, allowing constructions like if x = 2 with essentially the same meaning of = as the conditional usage in mathematics. The equal sign was reserved for this usage. Both usages have remained common in different programming languages into the early 21st century. As well as Fortran, = is used for assignment in such languages as C , Perl , Python , awk , and their descendants. But =

124-585: A triple bond is commonly rendered using a triple bar ). In recent years, the equal sign has been used to symbolize LGBT rights . The symbol has been used since 1995 by the Human Rights Campaign , which lobbies for marriage equality , and subsequently by the United Nations Free & Equal , which promotes LGBT rights at the United Nations . In Morse code , the equal sign is encoded by

155-509: A calculation. Starting in algebra courses, the sign takes on a relational meaning of equality between two calculations. Confusion between the two uses of the sign sometimes persists at the university level. Related: Robert Recorde Robert Recorde ( c.  1510 – 1558 ) was a Welsh physician and mathematician. He invented the equals sign (=) and also introduced the pre-existing plus (+) and minus (−) signs to English speakers in 1557. Born around 1510, Robert Recorde

186-475: A left-pointing arrow. Fortran did not have an equality operator (it was only possible to compare an expression to zero, using the arithmetic IF statement) until FORTRAN   IV was released in 1962, since when it has used the four characters .EQ. to test for equality. The language B introduced the use of == with this meaning, which has been copied by its descendant C and most later languages where = means assignment. Some languages additionally feature

217-447: A pair of parallels, or duplicate lines of one [the same] length, thus: =, because no 2 things can be more equal. "The symbol = was not immediately popular. The symbol || was used by some and æ (or œ ), from the Latin word aequalis meaning equal, was widely used into the 1700s" ( History of Mathematics , University of St Andrews ). In mathematics, the equal sign can be used as

248-470: A simple statement of fact in a specific case (" x = 2 "), or to create definitions (" let x = 2 "), conditional statements (" if x = 2, then ... "), or to express a universal equivalence (" ( x + 1) = x + 2 x + 1 "). The first important computer programming language to use the equal sign was the original version of Fortran , FORTRAN I, designed in 1954 and implemented in 1957. In Fortran, = serves as an assignment operator: X = 2 sets

279-467: A value of type Range is a range of integers, such as 1800..1899 . (1800..1899) == 1844 is false, since the types are different (Range vs. Integer); however (1800..1899) === 1844 is true, since === on Range values means "inclusion in the range". Under these semantics, === is non-symmetric ; e.g. 1844 === (1800..1899) is false, since it is interpreted to mean Integer#=== rather than Range#=== . The equal sign

310-532: Is also known not only to have often used a double hyphen ⹀ resembling an equal sign = between his two surnames in place of a hyphen, but also seems to have personally preferred that practice, to display equal respect for his father's French ethnicity and the Brazilian ethnicity of his mother. Instead of a double hyphen, the equal sign is sometimes used in Japanese as a separator between names. In Ojibwe ,

341-596: Is also used as a grammatical tone letter in the orthographies of Budu in the Congo-Kinshasa , in Krumen , Mwan and Dan in the Ivory Coast . The Unicode character used for the tone letter (U+A78A) is different from the mathematical symbol (U+003D). A possibly unique case of the equal sign of European usage in a person's name, specifically in a double-barreled name , was by pioneer aviator Alberto Santos-Dumont , as he

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372-492: Is done with the "\neq" command. Most programming languages, limiting themselves to the 7-bit ASCII character set and typeable characters , use ~= , != , /= , or <> to represent their Boolean inequality operator . The triple bar symbol ≡ (U+2261, LaTeX \equiv ) is often used to indicate an identity , a definition (which can also be represented by U+225D ≝ EQUAL TO BY DEFINITION or U+2254 ≔ COLON EQUALS ), or

403-400: Is incorrect, because each part of the equality has a different value. If interpreted strictly as it says, it would imply that A correct version of the argument would be This difficulty results from subtly different uses of the sign in education. In early, arithmetic-focused grades, the equal sign may be operational ; like the equal button on an electronic calculator, it demands the result of

434-534: Is true, but 0 == undefined is false, even though both sides of the == act the same in Boolean context. For this reason it is sometimes recommended to avoid the == operator in JavaScript in favor of === . In Ruby, equality under == requires both operands to be of identical type, e.g. 0 == false is false. The === operator is flexible and may be defined arbitrarily for any given type. For example,

465-584: Is used for equality and not assignment in the Pascal family, Ada , Eiffel , APL , and other languages. A few languages, such as BASIC and PL/I , have used the equal sign to mean both assignment and equality, distinguished by context. However, in most languages where = has one of these meanings, a different character or, more often, a sequence of characters is used for the other meaning. Following ALGOL, most languages that use = for equality use := for assignment, although APL, with its special character set, uses

496-412: The equality sign , is the mathematical symbol = , which is used to indicate equality in some well-defined sense. In an equation , it is placed between two expressions that have the same value, or for which one studies the conditions under which they have the same value. In Unicode and ASCII , it has the code point U+003D. It was invented in 1557 by Robert Recorde . The etymology of

527-451: The " spaceship operator ", or three-way comparison operator, <=> , to determine whether one value is less than, equal to, or greater than another. In some programming languages, == and === are used to check equality, so 1844 == 1844 will return true. In PHP , the triple equal sign , === , denotes value and type equality, meaning that not only do the two expressions evaluate to equal values, but they are also of

558-474: The "Gemowe lines" (meaning twin lines, from the Latin gemellus ) And to auoide the tediouſe repetition of theſe woordes : is equalle to : I will ſette as I doe often in woorke vſe, a paire of paralleles, or Gemowe lines of one lengthe, thus: =, bicauſe noe .2. thynges, can be moare equalle. And to avoid the tedious repetition of these words: "is equal to" I will set as I do often in work use,

589-506: The "equals" sign, which consists of two horizontal parallel lines, stating that no two things can be more equal. It appears that he afterwards went to London, and acted as physician to King Edward VI and to Queen Mary , to whom some of his books are dedicated. He was also controller of the Royal Mint and served as Comptroller of Mines and Monies in Ireland. After being sued for defamation by

620-400: The -/ 5 struck in bronze , the -/ 10 in nickel-brass (copper-nickel-zinc) and the -/50 and 1/= in cupro-nickel . Cupro-nickel 5/ = coins were introduced in 1972, followed by scalloped, nickel-brass -/ 10 in 1977. This First Series coins set, in circulation from 1966 up to 1984, was designed by Christopher Ironside OBE. In 1987, nickel-plated steel replaced cupro-nickel in

651-471: The -/ 50 and 1/ = , and cupro-nickel 5/ = and 10/ = coins were introduced, with the 5/ = decagonal in shape. In 1990, nickel-clad-steel 5/ = , 10/ = and 20/ = were introduced, followed by brass-plated steel coins for 100/ = in 1993, 50/ = in 1996 and copper-nickel-zinc 200/ = in 1998. Coins currently in circulation are the 50/ = , 100/ = , 200/ = , and 500/ = . The 500/ = coin

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682-411: The equal sign include the following: The equal sign is sometimes used incorrectly within a mathematical argument to connect math steps in a non-standard way, rather than to show equality (especially by early mathematics students). For example, if one were finding the sum, step by step, of the numbers 1, 2, 3, 4, and 5, one might incorrectly write Structurally, this is shorthand for but the notation

713-500: The following: In some areas of East Asia such as Japan, "≒" is used to mean "the two terms are almost equal", but in other areas and specialized literature such as mathematics, "≃" is often used. In addition to its mathematical meaning, it is sometimes used in Japanese sentences with the intention of "almost the same". The symbol used to denote inequation (when items are not equal) is a slashed equal sign ≠ (U+2260). In LaTeX , this

744-409: The letters B (-...) and T (-) run together (-...-). The letters BT stand for Break Text, and are put between paragraphs, or groups of paragraphs in messages sent via Telex , a standardised tele-typewriter. The sign, used to mean Break Text, is given at the end of a telegram to separate the text of the message from the signature. Symbols used to denote items that are approximately equal include

775-428: The prefix is used (e.g. TSh 10 million). This pattern was modelled on sterling 's pre-decimal notation, in which amounts were written in some combination of pounds (£), shillings (s), and pence (d, for denarius ). In that notation, amounts under a pound were notated only in shillings and pence. In 1966, coins were introduced in denominations of -/ 5 , -/ 10 , -/ 20 and -/ 50 and 1/ = , with

806-423: The readily available equal sign on most keyboards is commonly used as a substitute for a double hyphen. In linguistic interlinear glosses , an equal sign is conventionally used to mark clitic boundaries: the equal sign is placed between the clitic and the word that the clitic is attached to. In chemical formulas , the two parallel lines denoting a double bond are commonly rendered using an equal sign (hence,

837-404: The same data type. For instance, the expression 0 == false is true, but 0 === false is not, because the number 0 is an integer value whereas false is a Boolean value. JavaScript has the same semantics for === , referred to as "equality without type coercion". However, in JavaScript the behavior of == cannot be described by any simple consistent rules. The expression 0 == false

868-448: The value of X to 2. This somewhat resembles the use of = in a mathematical definition, but with different semantics: the expression following = is evaluated first, and may refer to a previous value of X . For example, the assignment X = X + 2 increases the value of X by 2. A rival programming-language usage was pioneered by the original version of ALGOL , which was designed in 1958 and implemented in 1960. ALGOL included

899-488: The word equal is from the Latin word æqualis , as meaning 'uniform', 'identical', or 'equal', from æquus ('level', 'even', or 'just'). The = symbol, now universally accepted in mathematics for equality, was first recorded by Welsh mathematician Robert Recorde in The Whetstone of Witte (1557). The original form of the symbol was much wider than the present form. In his book Recorde explains his design of

930-1012: Was issued on 8 September 2014. On 14 June 1966, the Benki Kuu Ya Tanzania ( Bank of Tanzania ) introduced notes for 5/ = , 10/ = , 20/ = and 100/ = . The 5/ = note was replaced by a coin in 1972. 50/ = notes were introduced in 1985, followed by 200/ = in 1986, 500/ = in 1989 and 1,000/ = in 1990. The 10/ = , 20/ = , 50/ = and 100/ = notes were replaced by coins in 1987, 1990, 1996 and 1994, respectively. 5,000/ = and 10,000/ = notes were introduced in 1995, followed by 2,000/= in 2003. A new series of notes came out in 2011. These new notes include many security features that prevent counterfeiting. Banknotes in circulation today are 500/ = , 1,000/ = , 2,000/ = , 5,000/ = and 10,000/ = Notes Sources Equals sign The equals sign ( British English ) or equal sign ( American English ), also known as

961-564: Was the second and last son of Thomas and Rose Recorde of Tenby , Pembrokeshire , in Wales . Recorde entered the University of Oxford about 1525, and was elected a Fellow of All Souls College there in 1531. Having adopted medicine as a profession, he went to the University of Cambridge to take the degree of M.D. in 1545. He afterwards returned to Oxford, where he publicly taught mathematics, as he had done prior to going to Cambridge. He invented

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