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From Wiktionary, the free dictionary

U+210D, ℍ
DOUBLE-STRUCK CAPITAL H

[U+210C]
Letterlike Symbols
[U+210E]

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

Translingual

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Alternative forms

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Etymology

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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

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