What ⍾ means
It represents BEL, the control code for an audible alert. ISO 2047 (1975) included ⍾ in a set of printable graphics for control codes—commands that usually do not appear as text.
During a 1998 discussion about Unicode symbols, an editor noted that the outline could also look like a tiny mushroom or a door buzzer. Those are informal visual readings, not additional standard meanings.
A niche technical mark with a bell-like shape; its control-code history is more specific than its everyday reading.
For a clear everyday warning, choose a familiar bell symbol; ⍾ can read as a computer-code mark.
Don't confuse it with
4Questions people ask
1Why does ⍾ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ⍾
⍾\237ECodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

