HTML Entity for Square Original Of (⊐)
What You'll Learn
How to display Square Original Of (⊐) in HTML using named, hexadecimal, decimal, and CSS escape methods. This character is U+2290 (SQUARE ORIGINAL OF) in the Mathematical Operators block (U+2200–U+22FF)—a set-theoretic relation indicating a square original (superset-like) relationship.
Render it with ⊐, ⊐, ⊐, or CSS \2290. Paired with Square Image Of U+228F (⊏, ⊏) and distinct from ordinary superset U+2283 (⊃, ⊃).
⚡ Quick Reference — Square Original Of
U+2290Mathematical Operators
⊐Hexadecimal reference
⊐Decimal reference
⊐Most readable option
Name Value
──────────── ──────────
Unicode U+2290
Hex code ⊐
HTML code ⊐
Named entity ⊐
CSS code \2290
Meaning Square original of (superset-like)
Paired with U+228F = square image of (⊏, ⊏)
Not the same U+2283 = superset (⊃)
Block Mathematical Operators (U+2200–U+22FF)Complete HTML Example
A simple example showing ⊐ using the named entity, hexadecimal code, decimal HTML code, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point::after{
content: "\2290";
}
</style>
</head>
<body>
<p>Square original of (named): ⊐</p>
<p>Square original of (hex): ⊐</p>
<p>Square original of (decimal): ⊐</p>
<p id="point">Square original of (CSS): </p>
</body>
</html>🌐 Browser Support
Square Original Of (⊐) is supported in all modern browsers when fonts include Mathematical Operators glyphs:
👀 Live Preview
See the square original of symbol in mathematical contexts:
🧠 How It Works
Named HTML Entity
⊐ is the semantic named entity for the square original of relation—the most readable option in source HTML.
Hexadecimal Code
⊐ uses Unicode hexadecimal 2290 to display ⊐ in HTML markup.
Decimal HTML Code
⊐ uses decimal Unicode value 8848 for the same character.
CSS Entity
\2290 is used in CSS stylesheets in the content property of pseudo-elements like ::after.
Same visual result
All four methods produce ⊐. Unicode U+2290 in Mathematical Operators (U+2200–U+22FF).
Use Cases
Square Original Of (⊐) commonly appears in:
Square original and superset-like relationships between sets.
Equations and formulas using the square original of operator.
Research on order theory, logic, and abstract algebra.
Tutorials on set relations and mathematical operators.
Scientific and engineering references with precise notation.
Web-based math tools displaying relation symbols.
💡 Best Practices
Do
- Use
⊐for readable source markup - Distinguish ⊐ (original) from ⊏ (image,
⊏) - Add context text when the symbol stands alone in educational content
- Pick one entity style (named, hex, or decimal) per project
- Test rendering with math-friendly fonts
Don’t
- Use padded Unicode notation like U+02290—the correct value is
U+2290 - Use CSS
\02290with a leading zero—prefer\2290 - Confuse
⊐with⊏or⊒ - Assume ⊐ and superset ⊃ (
⊃) are interchangeable in formal notation - Put CSS escape
\2290in HTML text nodes
Key Takeaways
Four HTML/CSS references all render ⊐
⊐ ⊐ ⊐For CSS stylesheets, use \2290 in the content property
Unicode U+2290 — SQUARE ORIGINAL OF (⊐)
⊐ is original; ⊏ is image (U+228F)
Previous: Square Image Of Or Equal To Next: Square Original Of Not Equal To
❓ Frequently Asked Questions
⊐ (named), ⊐ (hex), ⊐ (decimal), or \2290 in CSS content. All four render ⊐.U+2290 (SQUARE ORIGINAL OF). Mathematical Operators (U+2200–U+22FF). Hex 2290, decimal 8848, named ⊐.⊐ renders ⊐ (U+2290, square original of). ⊏ renders ⊏ (U+228F, square image of). They are paired operators in set notation.⊐, ⊐, or ⊐) go in markup. The CSS escape \2290 is used in stylesheets, typically in the content property of ::before or ::after. Same visual result, different layers of the stack.Explore More HTML Entities!
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