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The equal sign, '''equals sign''', or "'''='''" is a Mathematical Symbol used to indicate Equality . It was invented in 1557 by Welshman Robert Recorde . The equals sign is placed between the things stated to be equal. HISTORY The "=" symbol that is now universally accepted in mathematics for equality was first used by word ''aequalis'' meaning equal, was widely used into the 1700s ." RELATED SYMBOLS A symbol used to denote items that are Approximately equal is "≈" (wave lines), and the symbol used to denote when items are not equal is "≠" (slashed equal sign). The symbol "≡" is often used to indicate an Identity , or a Congruence Relation in Modular Arithmetic . The symbol "≘" can be used to express that an item corresponds to another. Equality of truth values, i.e. Bi-implication or Logical Equivalence , may be denoted by various symbols including =, ~, and <=>. In programming languages Most Programming Language s, which are limited to the ASCII character set, use "~=", "!=", "=/=" or "<>" to represent "not equal to"; "!=" has carried over into Newsgroup s and Internet Forum s. FALSE") IS TRUE, BUT ("0 SEE ALSO REFERENCES
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