X in Different Fonts

From Greek chi to Latin x

Unlike most letters, X doesn’t come straight from Phoenician. It was one of the extra letters the Greeks added. Different Greek cities used it differently: in the eastern alphabet that became standard Greek, X was chi, a kh sound, while the western alphabet used in southern Italy gave it the value ks. Latin took the western value, which is why X spells ks in box and taxi.

When Latin later borrowed Y and Z from Greek, it put them after X, so X ended up near the end of the alphabet. The cross shape also gave us Xmas: the X is the Greek chi that begins Christos.

Why X became the unknown

In his La Géométrie (1637), René Descartes used letters from the end of the alphabet, x, y and z, for unknowns and letters from the start for known values. The convention stuck. A popular story says x comes from an Arabic word for “thing” via Spanish, but there is no solid evidence for it.

Styled X and its gaps

Small caps has no X, so generators use a plain x; Q is the only other letter without a dependable small capital. Superscript has a lowercase ˣ (U+02E3) but no capital, so ˣ serves both. Subscript ₓ exists, and it appears in real labels such as NOₓ for nitrogen oxides.

The Fraktur 𝔵 is one of the harder blackletter letters for modern readers, because its crossing strokes are broken and curled rather than straight. Test it in context before using it in a gothic username.

The X lookalike problem

An X is two crossed lines, and that shape exists everywhere:

Greek Χ and Cyrillic Х are visually identical to X in most fonts. They are among the most common characters in spoofed usernames and domains, and many platforms reject mixed-script names for that reason.

Flipped and mirrored X

X is symmetric in every direction, so upside-down and mirrored X are just X. That makes it a dependable letter in upside-down text: it never needs a substitute.

How common is X

X is rare, about 0.15% of English letters. It appears in names more often than in words, which makes it a distinctive initial. As a single styled letter, ❌ and ✖ are emoji, while 🆇 (black square) and Ⓧ (bubble) stay as plain glyphs on most systems.

For a handwritten x, the cursive X lesson explains how the crossing stroke is added. To decorate a name with X-style symbols around it, try the text decorator.