U+3320 "㌠" Square Santiimu Unicode Character

U+3320 "㌠" Square Santiimu is a CJK compatibility ideograph representing the Japanese word "santiimu," which is a loanword from English meaning "centimeter." This character is part of the "CJK Compatibility" block, designed to encode precomposed square forms of katakana-based abbreviations that were used in East Asian typography for compactness, particularly in legacy systems and older documents. It visually combines the katakana syllables "sa" (サ), "n" (ン), "chi" (チ), "i" (イ), "mu" (ム), and "u" (ウ), arranged within a single square-width character space, and is primarily used for its historical relevance in text rendering rather than for modern standardized writing.