𝟏

𝟏 U+1D7CF, 𝟏
MATHEMATICAL BOLD DIGIT ONE
← 𝟎
[U+1D7CE] 		Mathematical Alphanumeric Symbols 𝟐 →
[U+1D7D0]

Translingual

Alternative forms

Symbol

𝟏

  1. (mathematics, set theory) The indicator function of a set.

Usage notes

The corresponding set is usually denoted by a subscript: 𝟏A.

Synonyms

  • (indicator function): χ, I
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