U+3309 "㌉" Square Onsu Unicode Character
U+3309 "㌉" Square Onsu is a CJK (Chinese, Japanese, and Korean) compatibility ideograph that represents a square or tate-chū-yoko form of the Japanese word "onsu," which is a unit of weight traditionally equal to approximately 28.3 grams, roughly corresponding to one ounce in the avoirdupois system. This character belongs to the CJK Compatibility block, specifically categorized as a square katakana expression used in East Asian typography to compress the two-kana reading "オン ス" into a single, compact glyph for vertical text writing or narrow formatting needs. While it is less common in modern digital text, it historically appears in specialized contexts such as traditional measurements, older documents, or decorative scripts, serving as a concise representation of a now largely obsolete unit in regions influenced by Japanese measurements.
General Properties
| Code Point | U+3309 |
| Version Added | 1.1 |
| Name | Square Onsu |
| Unicode 1.0 Name | Squared Onsu |
| Block | CJK Compatibility |
| General Category | Other Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Square |
| Decomposition Mapping | "オ" U+30AA Katakana Letter O "ン" U+30F3 Katakana Letter N "ス" U+30B9 Katakana Letter Su |
Encodings
| HTML Decimal Encoding | ㌉ |
| HTML Hex Encoding | ㌉ |
| UTF-8 Encoding | 0xE3 0x8C 0x89 |
| UTF-16 Encoding | 0x3309 |
| UTF-32 Encoding | 0x00003309 |
| C/C++/Java Escape | \u3309 |