The Greek Small Letter Heta symbol (ͱ). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Greek Letters.
The quickest way is to copy ͱ from this page and paste it anywhere. You can also insert it with its Unicode, HTML, or alt code listed above.
ͱ is U+0371 (decimal 881).
Use ͱ in HTML to render ͱ on a web page.
On Windows you can type it with Alt+881 (hold Alt and enter the number on the numeric keypad).
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