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Morse code abbreviations are not the same as prosigns.Morse abbreviations are composed of (normal) textual alpha-numeric character symbols with normal Morse code inter-character spacing; the character symbols in abbreviations, unlike the delineated character groups representing Morse code prosigns, are not "run together" or concatenated in the way most prosigns are formed.
Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.
Abbreviations of weights and measures are pronounced using the expansion of the unit (mg = "milligram") and chemical symbols using the chemical expansion (NaCl = "sodium chloride"). Some initialisms deriving from Latin may be pronounced either as letters ( qid = "cue eye dee") or using the English expansion ( qid = "four times a day").
The financial and general news media mostly use m or M, b or B, and t or T as abbreviations for million, billion (10 9) and trillion (10 12), respectively, for large quantities, typically currency [28] and population. [29] The medical and automotive fields in the United States use the abbreviations cc or ccm for cubic centimetres.
kilogram per cubic meter (kg/m 3) diameter: meter (m) distance: meter (m) direction: unitless impact parameter meter (m) differential (e.g. ) varied depending on context differential vector element of surface area A, with infinitesimally small magnitude and direction normal to surface S
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
Other "simple" ranges use an unspaced en dash as well: day–day: 5–7 January 1979; January 5–7, 1979; elections were held March 5–8. month–month: the 1940 peak period was May–July; the peak period was May–July 1940; (but the peak period was May 1940 – July 1940 uses a spaced en dash; see below)
A – adele ring or algebraic numbers. a.a.s. – asymptotically almost surely. AC – Axiom of Choice, [1] or set of absolutely continuous functions. a.c. – absolutely continuous.