What 𝑎 means
It represents a defined mathematical quantity.
Letters let formulas describe general quantities. In 1570, mathematician Gerolamo Cardano used a and b for known numbers; in 1591, mathematician François Viète used vowels for unknowns and consonants for knowns. René Descartes's 1637 algebra book La Géométrie used small italic a, b, c for knowns and x, y, z for unknowns.
Style can distinguish mathematical quantities
Math fonts can use italic, bold, and upright versions of one letter for different objects. Unicode keeps this form separate so plain-text formulas can preserve the distinction.
Part of the collection
Don't confuse it with
4
Related characters
1
Questions people ask
1Why does 𝑎 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
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How to type or find 𝑎
- Search it as
- math variable
- Shows up in
- Anything that takes text · its shape is whatever your font draws
𝑎\1D44Ea in math mode, for example $a$; the typesetter supplies mathematical italics.1D44E; the key sequence depends on the app.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.