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Abbreviation Meaning y: year or years YO yo y/o: years old YPLL: years of potential life lost YST: yolk sac tumor: yr: year or years This page was ...
This is a list of abbreviations used in medical prescriptions, including hospital orders ... years old μg microgram: mistaken for "mg", meaning milligram @ at
mmm – three-letter abbreviation for month, e.g. Mar; mmmm – month spelled out in full, e.g. March; d – one-digit day of the month for days below 10, e.g. 2; dd – two-digit day of the month, e.g. 02; ddd – three-letter abbreviation for day of the week, e.g. Fri; dddd – day of the week spelled out in full, e.g. Friday; Separators of ...
Although non-abbreviated years are generally preferred, two-digit ending years (1881–82, but never 1881–882 or 1881–2) may be used in any of the following cases: (1) two consecutive years; (2) infoboxes and tables where space is limited (using a single format consistently in any given table column); and (3) in certain topic areas if there ...
In general, however, abbreviations for years or months are usually avoided (e.g., Jan. '68 → January 1968) unless when there's a clear established practice in reliable sources to do otherwise (e.g. May 68, different from May 1968); for centuries numerals are given in text, capitalised (e.g., Crisis of the 3rd century → Crisis of the Third ...
Year numbers are based on inclusive counting, so that there is no "year zero". Years before the epoch are abbreviated BC for Before Christ or BCE for Before the Common Era. In Astronomical year numbering, positive numbers indicate years AD/CE, the number 0 designates 1 BC/BCE, −1 designates 2 BC/BCE, and so on.
About 31,709 years. megaannum: 10 6 yr: Also called "megayear". 1000 millennia (plural of millennium), or 1 million years (in geology, abbreviated as Ma). petasecond: 10 15 s: About 31 709 791 years. galactic year: 2.3 × 10 8 yr: The amount of time it takes the Solar System to orbit the center of the Milky Way Galaxy (approx 230 000 000 years ...
Also anno Urbis conditae (AUC) ("in the year that the City [Rome] was founded"). For example, the year 2007 AD is the year 2761 ab Urbe condita (753 + 1 + 2007 = 2761); though, rigorously speaking, the year AUC begins on April 21, the birthday of Rome (i.e., the day that Romulus was traditionally believed to have founded the Eternal City). (The ...