Mathematical Constants: Symbols, Meanings, LaTeX and Unicode

Mathematical constants have fixed values and recur across geometry, analysis, number theory, and applied science.

Symbol	Name and semantic role	LaTeX	Unicode	Action
∞	InfinityA named mathematical constant or fixed symbolic quantity.	`\infty`	`U+221E`
π	PiA named mathematical constant or fixed symbolic quantity.	`\pi`	`U+03C0`

Symbol

Name and semantic role

LaTeX

Unicode

Action

∞

InfinityA named mathematical constant or fixed symbolic quantity.

\infty

U+221E

PiA named mathematical constant or fixed symbolic quantity.

\pi

U+03C0

Symbol	Name and semantic role	LaTeX	Unicode
ⅇ	Double-Struck Italic eA named mathematical constant or fixed symbolic quantity.	`\mathbb{e}`	`U+2147`
ⅈ	Double-Struck Italic iA named mathematical constant or fixed symbolic quantity.	`\mathbb{i}`	`U+2148`
e	Euler’s NumberA named mathematical constant or fixed symbolic quantity.	`e`	`U+0065`
ℏ	Reduced Planck ConstantA named mathematical constant or fixed symbolic quantity.	`\hbar`	`U+210F`

Symbol

Name and semantic role

LaTeX

Unicode

Action

ⅇ

Double-Struck Italic eA named mathematical constant or fixed symbolic quantity.

\mathbb{e}

U+2147

ⅈ

Double-Struck Italic iA named mathematical constant or fixed symbolic quantity.

\mathbb{i}

U+2148

Euler’s NumberA named mathematical constant or fixed symbolic quantity.

e

U+0065

ℏ

Reduced Planck ConstantA named mathematical constant or fixed symbolic quantity.

\hbar

U+210F

Verified notation examples

∞\lim_{x\to\infty}1/x=0

πC=2\pi r

Frequently asked questions

How do I copy a mathematical constants symbol?

Use the Copy button in the table, then verify the Unicode code point if the destination can substitute look-alike characters.

When should I use LaTeX or MathML instead?

Use LaTeX for editable equations and MathML for semantic web mathematics. Plain Unicode is best for short text where the destination preserves the exact code point.