About Subset Of
Subset Of is the Unicode character ⊂ at codepoint U+2282 in the Mathematical Operators block of the Basic Multilingual Plane (BMP).
Reference
Two textbooks can print this symbol and mean different things by it, and both are ordinary practice. For one camp it is the general inclusion — every member of A is a member of B, the two possibly equal — which makes it a synonym for U+2286 SUBSET OF OR EQUAL TO. For the other it is strict: A sits inside B and is smaller, a synonym for U+228A SUBSET OF WITH NOT EQUAL TO. The unambiguous pair ⊆ and ⊊ exist because of exactly this, and careful writing says early which convention it is using.
Unicode takes the first side without comment: the alias recorded for the character is "included in set". It shares the general shape of element of but not its job — that one relates a member to a set, this one relates two sets, and swapping them is a genuine error rather than a stylistic one. Its East Asian Width is Ambiguous, which under UAX #11 records that it appeared in an East Asian legacy set as a wide character.
Typical uses
- Set inclusion in mathematics, under whichever convention the text declares
- Type hierarchies and subtyping in formal specifications
- Subgroup and subspace relations in algebra
Also encoded as
- Unicode 1.1 (1993), Mathematical Operators — general category Sm
- JIS X 0208 — 0x223E (0x81BC in Shift-JIS and CP932)
- KS X 1001 — 0x2178
- Unambiguous alternatives: U+2286 ⊆ and U+228A ⊊
Developer Notes
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How to Use Subset Of
To use the Subset Of symbol (⊂) in HTML, insert the
entity ⊂ directly into your markup. The decimal entity ⊂ works in any HTML-serialised document.
In CSS pseudo-elements use content: '\2282';.
In JavaScript and TypeScript the escape '\u2282' evaluates to ⊂. In Python source, write '\u2282'.
The character encodes to E2 8A 82 as UTF-8 bytes and 2282 as UTF-16 code units. Its decimal codepoint is 8834.
This is a text-based Unicode character. It will render in the current font on most platforms. If a font lacks this glyph, the browser may show a placeholder or fall back to a system font.