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A phonon is a collective excitation in a periodic, ... The plus sign results in the so-called optical mode, and the minus sign to the acoustic mode. In the optical ...
A plus sign prefixed to a telephone number is used to indicate the form used for International Direct Dialing. [23] Its precise usage varies by technology and national standards. In the International Phonetic Alphabet , subscripted plus and minus signs are used as diacritics to indicate advanced or retracted articulations of speech sounds.
Feminine ordinal indicator, Degree sign: −: Minus sign: Hyphen-minus, Commercial minus: ×: Multiplication sign: X mark # Number sign: Numero sign. Also known as "octothorpe", "hash" and "hashtag sign" Pound sign № Numero sign: Number sign: Obelus: Division sign, Dagger, Commercial minus, Index ( ) Parenthesis: Bracket, Angle bracket ...
The plus and minus symbols are used to show the sign of a number. In mathematics, the sign of a real number is its property of being either positive, negative, or 0.Depending on local conventions, zero may be considered as having its own unique sign, having no sign, or having both positive and negative sign.
unstrict inequality signs (less-than or equals to sign and greater-than or equals to sign) 1670 (with the horizontal bar over the inequality sign, rather than below it) John Wallis: 1734 (with double horizontal bar below the inequality sign) Pierre Bouguer
"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Good sleep is crucial for your overall health, but new research suggests it could impact your ...
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+ ∥ \lor or \vee \parallel logical (inclusive) disjunction: or propositional logic, Boolean algebra: The statement A ∨ B is true if A or B (or both) are true; if both are false, the statement is false.