U+3348 "㍈" Square Mikuron Unicode Character

U+3348 "㍈" Square Mikuron is a precomposed CJK compatibility ideograph that represents the word "micron" written in Japanese katakana, abbreviated into a single square character as part of a set of units used in East Asian typography. It is found in the CJK Compatibility block and was originally included for compatibility with older character encodings, where it was treated as a single unit for width and alignment. This character corresponds to the standard Japanese abbreviation for the metric unit "micrometer" (one millionth of a meter), though its usage has largely been supplanted by more modern encoding practices.