ℍ

See also: Appendix:Variations of "h"

ℍ U+210D, ℍ DOUBLE-STRUCK CAPITAL H ← ℌ [U+210C] Letterlike Symbols ℎ → [U+210E]

Translingual

Etymology

The first letter of the surname of William Rowan Hamilton (1805–1865), written in blackboard bold.

Symbol

ℍ

1. (mathematics) The symbol for the set of quaternions.