ₓ Subscript X
Subscript x (ₓ) is one of only thirteen subscript letters Unicode actually has — used for vector components like aₓ and Fₓ.
Also known as: subscript x, small x below, x component subscript, latin subscript small letter x.
Codes
| Symbol | ₓ | |
| All subscript letters | ₐ ₑ ₒ ₓ ₔ ₕ ₖ ₗ ₘ ₙ ₚ ₛ ₜ | |
| Unicode | U+2093 | |
| HTML entity (decimal) | ₓ | |
| HTML entity (hex) | ₓ | |
| CSS | \2093 | |
| LaTeX | a_x | |
| Windows Alt code | Alt + 8339 |
How to type ₓ (Subscript X)
Alt + 8339 works in apps that accept decimal-Unicode Alt input (Word among them). There is no short Alt + 0nnn code. Elsewhere press Win + . (period) and search “subscript”, or copy ₓ above.
No default keystroke. Open Character Viewer (Control + Cmd + Space), search “latin subscript small letter x”, and double-click ₓ.
Type 2093, then press Alt + X to get the character ₓ.
Insert → Special characters, then search “subscript x” or “latin subscript”.
In math mode write a_x for the x-component, or \vec{a}_x. Do not paste ₓ into LaTeX source.
Usage
- ₓ marks a component along the x-axis: aₓ is the x-component of acceleration, Fₓ of force, vₓ of velocity.
- Unicode has only thirteen subscript letters — ₐ ₑ ₒ ₓ ₔ ₕ ₖ ₗ ₘ ₙ ₚ ₛ ₜ. There is no subscript b, c, d, f, g, i, j, q, r, u, v, w, y or z, and no uppercase subscript letters at all. They were added for phonetics, not for maths, which is why the set looks arbitrary.
- That gap is the reason a “subscript generator” cannot convert an arbitrary word: aᵢ and aⱼ, the two most common index letters in maths, have no subscript character. For those, use real subscript formatting or LaTeX a_i, a_j.
- Like the digits, ₓ is a character rather than formatting, so it survives being pasted into plain text — a filename, a CSV cell, a code comment.