ℍ

See also: Appendix:Variations of "h"

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

𝐇 U+1D407, 𝐇 MATHEMATICAL BOLD CAPITAL H ← 𝐆 [U+1D406] Mathematical Alphanumeric Symbols 𝐈 → [U+1D408]

Translingual

Alternative forms

• 𝐇

Etymology

From 𝐇, after the first letter of the surname of William Rowan Hamilton (1805–1865). The usage of blackboard bold dates to the 1960s.

Symbol

ℍ

1. (mathematics) Alternative form of 𝐇, the set of quaternions.