Digit One 1

U+0031

Symbol Meaning

The Arabic digit one belongs to the numerals which are widely spread around the planet. This positional counting system appeared in India in the 5th century or even earlier. The Arabs borrowed it from the Indians. Al-Khwarizmi wrote a book called “On the Indian Calculation,” which helped to spread the Arabic digits. Later this counting system came to Europe through Spain. Pope Sylvester II advocated for the replacement of Roman numerals with Arabic ones in the 10th century. In the 12th century, Al-Khwarizmi's book “On the Indian Calculation” was translated into Latin, which played an important role in the adoption of Arabic numerals.

The symbol “Digit One” is included in the “ASCII digits” subblock of the “Basic Latin” block and was approved as part of Unicode version 1.1 in 1993.

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Unicode Name	Digit One
Unicode Number
Plane	0: Basic Multilingual Plane
Unicode Block	Basic Latin
Unicode Subblock	ASCII digits
Unicode Version	1.1 (1993)
Alt Code	Alt 49

Type of paired mirror bracket (bidi)	None
Composition Exclusion	No
Case change	0031
Simple case change	0031
ID_Continue	+
XID_Continue	+
Grapheme_Base	+
scripts	Common
Hex_Digit	+
ASCII_Hex_Digit	+

Encoding	hex	dec (bytes)	dec	binary
UTF-8	31	49	49	00110001
UTF-16BE	00 31	0 49	49	00000000 00110001
UTF-16LE	31 00	49 0	12544	00110001 00000000
UTF-32BE	00 00 00 31	0 0 0 49	49	00000000 00000000 00000000 00110001
UTF-32LE	31 00 00 00	49 0 0 0	822083584	00110001 00000000 00000000 00000000