𝟙

𝟙	U+1D7D9, 𝟙 MATHEMATICAL DOUBLE-STRUCK DIGIT ONE

← 𝟘
[U+1D7D8]

Mathematical Alphanumeric Symbols

𝟚 →
[U+1D7DA]

Translingual edit

Symbol edit

𝟙

(mathematics) indicator function

Usage notes edit

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

Synonyms edit

(indicator function): 𝟏, χ, I

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