What ㌘ means
It stands for gram, a unit used to weigh things.
Ordinarily, Japanese spells it グラム with three katakana, Japanese sound signs.
An 1855 Japanese book from the Edo period, a premodern era, records ガラムマ; a 1878 translation uses ガラム for the metric unit. These are spellings of the borrowed word, not the compact sign.
Kumimoji was Japanese typesetting: it fit small kana (syllable signs) into one square cell for dense tables and notes. Fonts may draw the tiny signs differently.
Don't confuse it with
1Questions people ask
1Why does ㌘ 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 ㌘
Windows (Word)
Alt+XType 3318, then Alt+X to get ㌘.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “square guramu”.
Linux
Ctrl+Shift+UType 3318, then Enter or Space.
HTML
㌘CSS
\3318How to type ㌘
For ordinary Japanese, enter グラム; for the square form, use a character map or Unicode picker to look up U+3318.
Codes and encoding1 code points
HTML decimal
㌘
HTML hex
㌘
CSS content
content: "\3318";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E3%8C%98
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.