The Upper Half Block symbol (▀). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Block Elements.
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+2580 (decimal 9600).
Use ▀ in HTML to render ▀ on a web page.
On Windows you can type it with Alt+9600 (hold Alt and enter the number on the numeric keypad).
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