Definition: Annulus or Annals are two Roman numeral numerals used for the Roman numbers 10 and 5 (or 20 in ancient Greek numerals), respectively. They represent the first two digits of each number, as follows:
- "1" is the first digit.
- "5" is the second digit.
They are also commonly used to denote a letter that has no preceding consonant:
A
,
C
,
G
, and so on.
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