Square M Ohm

It means MΩ: a megaohm, a unit of electrical resistance.

A megaohm is one million ohms. The square form fits MΩ into one East Asian text cell, the square-sized position commonly used for one Han character.

The square M ohm form belongs to a set of abbreviations mostly derived from Korean legacy standards. A Korean standards table records ㏁ as KS code A7DB and marks it fullwidth and centered.

Why is the M ohm symbol in a square?

The square lets the abbreviation occupy one full text cell.

In East Asian typography, a short Latin unit label can sit in a square cell beside Han characters. The box changes the layout, not the electrical unit.

Unicode keeps this form for compatibility with earlier character sets. For ordinary technical prose, write MΩ; modern layout styles can center ordinary letters in the same full-size cell when needed.

What can change when ㏁ is processed?

Its reading stays, but its stored form or display can change.

Compatibility normalization, a text-cleanup process called NFKC or NFKD, expands it to MΩ. The unit reading stays the same, but the original single character is lost; this is why saved text may show MΩ.

A blank or missing-character square means the font cannot draw this glyph; the underlying text may still contain ㏁. To enter the single character, search a character map or Unicode picker for SQUARE M OHM.