راژمان ِ عددهای ِ رومی râžmân-e adadhâ-ye Rumi
*Fr.: numération romaine*
A → *number system* in which letters represent numbers,
still used occasionally today. The cardinal numbers are
expressed by the following seven letters: I (1), V (5), X (10), L
(50), C (100), D (500), and M (1,000).
If a numeral with smaller value is written on right of greater value then
smaller value is added to the greater one.
If it is preceded by one of lower value, the smaller numeral is
subtracted from the greater. Thus VI = 6 (V + I), but IV = 4 (V -
I). Other examples are XC (90), CL (150), XXII (22), XCVII (97),
CCCXCV (395). If symbol is repeated then its value is added. The symbols I, X, C and
M can be repeated maximum 3 times.
A dash line over a numeral multiplies the value by 1,000. For example
V^{-} = 5000, X^{-} = 10,000, C^{-} = 100,000, and
DLIX^{-} = 559,000. → *numeral*; → *system*. |