What ㏐ means
It denotes luminous flux measured in lumens. The square fits lm into a text cell sized like a Chinese, Japanese, or Korean character.
It belongs to a legacy East Asian convention that placed Latin unit abbreviations in the text cell used for Chinese, Japanese, or Korean characters.
㏐ and lm name the same unit. ㏓ packages lx (lux), which measures illuminance—the light reaching a surface—not luminous flux.
Specialist and legacy-typographic; plain lm is clearer in new technical prose.
The square changes layout, not the unit.
Don't confuse it with
1Questions 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 ㏐
㏐\33D0Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
