The Lower One Quarter 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+2582 (decimal 9602).
Use ▂ in HTML to render ▂ on a web page.
On Windows you can type it with Alt+9602 (hold Alt and enter the number on the numeric keypad).
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