Double Nested Less-than Symbol
⪡ is the double nested less-than symbol (U+2AA1) used in specialized mathematical notation.
U+2AA1
The symbol ⪡, named Double Nested Less-Than, is a mathematical character with a dedicated Unicode code point. It’s useful when you need a clear visual distinction between nested comparison symbols.
Double Nested Less-than Symbol Meaning
⪡ (Unicode U+2AA1) is called DOUBLE NESTED LESS-THAN. As its name suggests, it visually indicates a “less-than” relationship in a nested or multi-layered form. This makes it handy in formal writing, diagrams, and typesetting where plain < may not communicate the intended structure. You’ll most often encounter it in math-oriented contexts such as proofs, technical notation, and specialized editor inputs. When copying, using the correct Unicode character (rather than approximations) helps ensure consistent rendering across fonts and platforms that support it.
Common uses
- •Math typesetting where nested less-than notation is required
- •Technical documents or reports using specialized comparison symbols
- •Diagram labels in logic or order-related schematics
- •Programming documentation that references formal mathematical symbols
- •Design of math-themed UI text where exact Unicode glyphs matter
Examples
⪡ Double Nested Less-Than
- ⪡If a ⪡ b, then a is nested-less-than b in the defined ordering.
- ⪡For all x, we write x ⪡ y to denote the nested relation.
- ⪡In the expression, ⪡ replaces < to reflect the deeper structure.
- ⪡The diagram marks a ⪡ b with a double nested comparison sign.
- ⪡Use ⪡ in your proof to distinguish this constraint from standard <.
Variations
Ready to copy
Technical codes
| Unicode | U+2AA1 | |
| HTML Entity | ⪡ | |
| HTML Code | ⪡ | |
| CSS | \2AA1 | |
| Alt Code | Alt + 10913 | |
| Decimal | 10913 |
How to type Double Nested Less-than Symbol (⪡)
On Windows
Hold Alt and type 10913 on the numeric keypad. In Word, type 2AA1 then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 2AA1. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 2aa1, 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 the Double Nested Less-than symbol mean?
⪡ (Unicode U+2AA1) is called DOUBLE NESTED LESS-THAN. As its name suggests, it visually indicates a “less-than” relationship in a nested or multi-layered form. This makes it handy in formal writing, diagrams, and typesetting where plain < may not communicate the intended structure. You’ll most often encounter it in math-oriented contexts such as proofs, technical notation, and specialized editor inputs. When copying, using the correct Unicode character (rather than approximations) helps ensure consistent rendering across fonts and platforms that support it.
What is the Unicode code point for ⪡?
⪡ is U+2AA1 (Unicode name: DOUBLE NESTED LESS-THAN).
How can I copy ⪡ into HTML?
You can use the HTML entity ⪡.
What is the CSS escape for ⪡?
The CSS escape is \\2AA1.
Does ⪡ have a standard name I can search for?
Yes. The common readable name is “Double Nested Less-Than,” matching the Unicode name.