What ℾ means
Use a Unicode character picker or a math editor's input command.
At Julia's interactive prompt, type \bbGamma and press Tab. A Unicode-aware character picker can find the character by name or accept U213E if it supports code-point entry.
What does ℾ mean?
ℾ is a double-struck capital gamma used as a distinct mathematical letter.
Its shape alone does not fix its meaning. The formula around it tells you what it names; it does not automatically stand for the gamma function, a universal constant, or a particular set.
Blackboard bold began as a practical legibility trick: doubled strokes helped mathematical letters stand out on blackboards and typewriters. Use is documented in France in the late 1950s and at Princeton in the early 1960s; printed mathematics later used the style to mark distinct notation.
Technical and mathematical; it marks notation, not tone or decoration.
Do not substitute ℾ for Γ unless your notation defines the distinction.
Part of the collection
Don't confuse it with
3
Questions people ask
1Why does ℾ look different in different fonts?
Font-dependent. Unicode permits different fonts to draw the double strokes with different weight and shape.
More like this
11
How to type or find ℾ
- Also called
- blackboard bold gamma · open-face gamma
- Search it as
- bbgamma · mathbb gamma · double-struck gamma
- Shows up in
- Anything that takes text · its shape is whatever your font draws
ℾ\213E\bbGamma and press Tab.\Bbb in 1985. Exact syntax depends on your package and font.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.