7

Glyph origin
A West Arabic numeral, ultimately from Indic numerals (compare Devanagari ). See for more.

Symbol

 * 1) The cardinal number seven.
 * 2) A digit in the decimal system of numbering, as well as octal, and hexadecimal.
 * 3)  an indicator that a chord is a dominant or major seventh chord
 * 4)  tone number 7, typically identified with dark entering yin ru (陰入)

Alternative forms
The following are equivalent forms as digits:

The following are only equivalent as representations of the cardinal number:

Noun

 * 1)   720&deg; spin

Etymology
From, a near homophone of in.