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List of letters used in mathematics and science; Glossary of mathematical symbols; List of mathematical uses of Latin letters; Greek letters used in mathematics, science, and engineering; Physical constant; Physical quantity; International System of Units; ISO 31
A shortening is an abbreviation formed by removing at least the last letter of a word (e.g. etc. and rhino), and sometimes also containing letters not present in the full form (e.g. bike). As a general rule, use a full point after a shortening that only exists in writing (e.g. etc. ) but not for a shortening that is used in speech (e.g. rhino ).
North American usage is typically to end all abbreviations with a period/point (Dr. Smith of 42 Drummond St.) but in common British and Australian usage, no period/point is used if the abbreviation (contraction) ends in the last letter of the unabbreviated form (Dr Smith of 42 Drummond St) unless confusion could result. This is also common ...
The blackboard bold letter style originated in the 1960s to distinguish bold letters from ordinary letters on a blackboard or using a typewriter; in professionally typeset documents, bold fonts were used for the same purpose. Since then, blackboard bold has gradually gained currency, and is now commonly used in mathematical printing to denote ...
Any conventional abbreviations found in a standard dictionary, such as: "current": AC (for "alternating current"); less commonly, DC (for "direct current"); or even I (the symbol used in physics and electronics) Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI
Re – real part of a complex number. [2] (Also written.) resp – respectively. RHS – right-hand side of an equation. rk – rank. (Also written as rank.) RMS, rms – root mean square. rng – non-unital ring. rot – rotor of a vector field. (Also written as curl.) rowsp – row space of a matrix. RTP – required to prove.
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An initialism or acronym is an abbreviation consisting of the initial letter of a sequence of words without other punctuation. For example, FBI (/ˌɛf.biːˈaɪ/), USA (/ˌjuː.ɛsˈeɪ/), IBM (/ˌaɪ.biːˈɛm/), BBC (/ˌbiː.biːˈsiː/). When initialism is used as the preferred term, acronym refers more specifically to when the abbreviation ...