The Apl Functional Symbol Quad Down Caret symbol (⍌). Copy and paste it, or use its Unicode, HTML, and CSS codes.
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The quickest way is to copy ⍌ from this page and paste it anywhere. You can also insert it with its Unicode, HTML, or alt code listed above.
⍌ is U+234C (decimal 9036).
Use ⍌ in HTML to render ⍌ on a web page.
On Windows you can type it with Alt+9036 (hold Alt and enter the number on the numeric keypad).
Yes — copying is completely free and unlimited, and works right in your browser with no sign-up.