Combining square below is the Unicode character at U+033B in Combining Diacritical Marks. Official name: COMBINING SQUARE BELOW. It is a non-spacing mark placed immediately after a base letter to add a small square under it.
Remember
Character ◌̻ (under base letter)
Unicode U+033B
Named entity (none)
Hex entity ̻
Decimal ̻
CSS escape \033B
Not the same ⊓ · ̱ · ̣
Prefer ̻ or ̻ right after the base letter. Example: a̻ → a̻. Do not confuse it with the math operator square cap (⊓).
Using Hex Code: a̻
Using HTML Code: n̻
z̻ (CSS square below on z)
With letter a: a̻
Not square cap (⊏ = U+2293)
How It Works
1. Hex:U+033B → ̻ right after a. The browser combines them into a̻.
2. Decimal: same code point as 827 → ̻ after n. Same combining mark.
3. CSS: use \033B in content (not an HTML entity). #point::after appends the mark after z, producing z̻.
4. Order: always write the base letter first, then the combining entity.
5. No named entity: HTML5 does not define a name for U+033B — and ⊓ is a different character (U+2293).
Pitfalls & Tips
Common mistakes when working with U+033B.
Order
Base letter first
Write a̻, not ̻a. The mark attaches to the preceding character.
vs ⊓
Not square cap
⊓ (U+2293) is a math operator. U+033B is a combining diacritic under a letter.
Named
No named HTML entity
There is no &squarebelow;. Use ̻ or ̻.
CSS vs HTML
Do not mix escapes
\033B belongs in CSS strings. ̻ / ̻ belong in HTML.
Fonts
Check combining support
Some fonts render combining marks poorly. Test with fonts that include Combining Diacritical Marks.
A11y
Explain the mark
Screen readers may ignore or misname combining marks. Add nearby text when the square carries meaning.
Compatibility
Browser Support
Combining square below (U+033B) and its entity forms (̻, ̻, CSS \\033B) are supported in all mainstream browsers. Visible glyphs depend on Combining Diacritical Marks font coverage.
✓ Universal support
Square Below (U+033B)
Encode with hex, decimal, or CSS escape after a base letter — same code point everywhere encoding is supported.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+033B / entitiesFull support
Bottom line: Prefer ̻ or ̻ right after the base letter. Use \\033B only inside CSS content. There is no named entity.
Remember
Key Takeaways
Unicode: combining square below is U+033B (decimal 827).
HTML: no named entity — use ̻ / ̻ after the base letter.
CSS: use \033B inside content for generated text.
Meaning: attaches under a letter — not ⊓ (⊓).
One line: base + U+033B → a̻ / a̻ / CSS \033B (no named entity).
Frequently Asked Questions
Use ̻ (hex), ̻ (decimal), or the CSS escape \033B in content. Place it immediately after the base letter (e.g. a̻). There is no named HTML entity.
U+033B (COMBINING SQUARE BELOW). Hex 033B, decimal 827. It belongs to Combining Diacritical Marks (U+0300–U+036F).
No. Use numeric references ̻ or ̻, or type the combining mark after a letter in UTF-8.
No. U+033B attaches a square under a letter. Square cap (U+2293, ⊓) is a separate math operator.
Use it in linguistic and phonetic notation when a square under a letter is required — not as a substitute for CSS box styles or the math symbol ⊏.
HTML entities (̻ or ̻) go in markup after the base character. The CSS escape \033B goes in stylesheet strings (usually content on ::before/::after).
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Did you know?
Combining square below is Unicode U+033B (decimal 827) in Combining Diacritical Marks (U+0300–U+036F). Official name: COMBINING SQUARE BELOW. HTML5 has no named entity — use ̻ or ̻ right after a base letter. Do not confuse with square cap U+2293 (⊓, ⊓), a Mathematical Operators symbol.
