Mathematical symbol Not a Subset of
About this character
The character ⊄ carries the official Unicode name “Mathematical symbol Not a Subset of” and the code point U+2284, which is 8836 in decimal. It belongs to the Mathematical Operators block (U+2200–U+22FF), which gathers the operators, quantifiers and relations of algebra, logic and set theory.
In memory, ⊄ takes 3 bytes in UTF-8 (0xE2 0x8A 0x84) and 1 in UTF-16 (0x2284). That difference is why badly configured forms or databases garble this character: they assume one byte per character.
How to type ⊄
| System | What to do |
|---|---|
| Windows | In Word or WordPad, type 2284 and press Alt + X to turn the code into the character. |
| macOS | On a Mac, open the Character Viewer with Ctrl + ⌘ + Space and search for “Mathematical symbol Not a Subset of”. |
| Linux | On Linux (GTK), type Ctrl + ⇧ + U, 2284 then press Enter. |
| HTML / Web | In an HTML page, write ⊄. Use \2284 in CSS, \u2284 in JavaScript and \u2284 in Python. |
| On this site | The simplest route is the Copy button above: the character goes straight to your clipboard, ready to paste anywhere. |
Keyboards that include ⊄
This character is not on any common physical layout, so the Copy button above is the quickest way to get it into a document.
Codes and encodings
| Property | Value |
|---|---|
| Code point | U+2284 |
| Unicode block | Mathematical Operators (U+2200–U+22FF) |
| Decimal | 8836 |
| Hexadecimal | 0x2284 |
| Octal | 021204 |
| Binary | 10001010000100 |
| UTF-8 bytes | 0xE2 0x8A 0x84 |
| UTF-16 units | 0x2284 |
| Named HTML entity | ⊄ |
| Decimal HTML entity | ⊄ |
| Hex HTML entity | ⊄ |
| CSS escape | \2284 |
| JavaScript escape | \u2284 |
| Python escape | \u2284 |
| URL encoding | %E2%8A%84 |
Frequently asked questions
What is the Unicode code for ⊄?
Its code point is U+2284, which is 8836 in decimal and 021204 in octal. In HTML you can write it as ⊄ or ⊄.
Why does ⊄ show up as a box or a question mark?
An empty box means the font has no glyph for U+2284. The character is still in the text: switching to a font that covers the block (Noto, DejaVu or Segoe UI Symbol) makes it appear.
Can I use ⊄ in a filename, a URL or a password?
In a URL it must be encoded as %E2%8A%84. Modern filesystems accept it, though it is still risky when moving files between systems. For passwords, some forms reject non-ASCII characters outright.