What 𝐇 means
Type its hexadecimal value, then press AltX.
As of 2026, in Word for Windows, type 1D407 then press Alt+X; Word converts the hexadecimal value to this character. This is an app-specific shortcut, not a system-wide key sequence.
What does bold H mean?
It is a distinct mathematical symbol, defined by its formula.
Mathematical writing used letter styles such as bold to distinguish variables before Unicode gave this character its own code. In physics and engineering, bold letters commonly stand for vectors, but that convention does not tell you what H means in a particular formula.
In 1999, a Unicode proposal asked for full bold, italic, script, and related alphabets so plain text could preserve such distinctions; it notes that plain H and bold H may name different variables. A few special mathematical letter forms had already been encoded, and this alphabet extended them into consistent sets. These characters also get used to imitate bold in plain text, though formatting ordinary letters is easier for search and accessibility tools to process.
Part of the collection
Don't confuse it with
1
Questions people ask
1Why does 𝐇 show as a box on my screen?
The font or app may not include a glyph for this mathematical alphabet. As of 2026, Noto Sans Math lists Mathematical Alphanumeric Symbols in its character coverage; a font that includes these glyphs can display it.
More like this
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How to type or find 𝐇
- Search it as
- bold h · unicode bold h · fancy h · bold capital letter h
- Shows up in
- Anything that takes text · its shape is whatever your font draws
𝐇\1D4071D407 then press Alt+X to insert the character.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.