The Braille Pattern Dots-2468 symbol (⢪). Copy and paste it, or use its Unicode, HTML, and CSS codes.
More from Braille.
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+28AA (decimal 10410).
Use ⢪ in HTML to render ⢪ on a web page.
On Windows you can type it with Alt+10410 (hold Alt and enter the number on the numeric keypad).
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