Image Of Symbol
⊷ is the “image of” symbol used to refer to the image (output) of a function or mapping.
U+22B7
The symbol ⊷, pronounced “image of,” is commonly used in mathematical notation. It helps you write compact expressions for the set of values produced by a function or mapping.
Image Of Symbol Meaning
⊷ is the mathematical “image of” symbol. It is used to indicate the image (the resulting set or values) of some object under a function or mapping. In practice, you’ll see it in contexts where authors want to specify what a map sends an input set to, or what a transformation produces. For example, it can appear alongside functions, restrictions, or subset mappings to describe the outputs those inputs generate. When typesetting, ⊷ is typically treated as a standalone math symbol, so it works well in equations and set-notation style expressions.
Common uses
- •Writing the image of a function in equation form
- •Denoting the output set of a mapping on a subset
- •Specifying results of a transformation in set-theory notation
- •Labeling steps in proofs where images are computed
- •Formatting math notes, worksheets, and documentation consistently
Examples
⊷ Image of symbol
- ⊷Let f: A → B. The image of A under f is ⊷(A).
- ⊷For x ∈ A, the image of x by f can be written using ⊷.
- ⊷The image of a subset S under the map is written with ⊷(S).
- ⊷Compute ⊷(f(S)) to describe the resulting set of outputs.
- ⊷In this proof, we replace the domain by its image ⊷.
Variations
Ready to copy
Technical codes
| Unicode | U+22B7 | |
| HTML Entity | ⊷ | |
| HTML Code | ⊷ | |
| CSS | \22B7 | |
| Alt Code | Alt + 8887 | |
| Decimal | 8887 |
How to type Image Of Symbol (⊷)
On Windows
Hold Alt and type 8887 on the numeric keypad. In Word, type 22B7 then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 22B7. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 22b7, then press Enter or Space.
Anywhere
Copy ⊷ with the button above and paste it wherever you need it — this works on every device and in every app, with no keyboard shortcut to remember.
FAQ
What does ⊷ mean?
⊷ is the “image of” symbol used to denote the image/result of a function or mapping in mathematical notation.
Where would I use the image of symbol?
You typically use ⊷ in math writing when you want to describe the set of outputs produced by a function applied to a domain or subset.
How do I copy ⊷ into HTML?
You can use the HTML entity ⊷ (as provided on this page) or copy the symbol directly.
How can I type ⊷ in code?
For JavaScript, you can use the escape \\u{22B7}; for CSS you can use \\22B7 (as provided on this page).