What ℇ means
It points to Euler's number; γ marks another constant. Euler's number, usually written e, is the base of natural logarithms. The Euler–Mascheroni constant is different and arises in work with harmonic sums such as 1 1/2 1/3 ….
Euler used e for his number in an unpublished manuscript dated 1727–1728. Bretschneider used γ for the Euler–Mascheroni constant in 1835; C is another historical notation for it.
A Unicode discussion in 2002 called the character's source name ambiguous and raised the possibility that ℇ preserved an older notation for Euler's number. The author's definitions are more reliable than the label alone.
Use ℇ only when the notation asks for it
Use it only when the notation explicitly calls for it. In prose and standard formulas, upright e is clearer and more familiar.
Some TeX packages offer the \Eulerconst command, but availability depends on the package and font.
Specialist mathematical typography, not a default form for ordinary e.
Check the definitions before treating ℇ as γ.
Don't confuse it with
2
Related characters
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Questions people ask
1Why does ℇ look wrong in my font?
It can: as of 2020, a TeX discussion described ℇ as uncommon and poorly drawn in some fonts. Check whether the selected font supports it; ordinary upright e is a practical fallback.
More like this
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How to type or find ℇ
- Search it as
- Euler's e · Euler number · upright e · e constant · Eulerconst
- Shows up in
- Anything that takes text · its shape is whatever your font draws
ℇ\2107Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.