U+3391 "㎑" Square Khz Unicode Character
Unicode Version 17.0
㎑
U+3391 "㎑" Square Khz is a precomposed CJK compatibility ideograph representing the unit of frequency "kilohertz" and is part of the CJK Compatibility block, which was designed for compatibility with legacy East Asian character encodings. This single character encodes the three elements "k," "H," and "z" into one square glyph, reflecting its origin in vertical text layouts or space-constrained environments like telecommunication displays and early computing systems. Although it is not commonly used in modern digital text, it remains available in Unicode for historical and interoperability reasons, allowing systems to faithfully reproduce older documents or user interfaces that rely on such compact symbols.
General Properties
| Code Point | U+3391 |
| Version Added | 1.1 |
| Name | Square Khz |
| Unicode 1.0 Name | Squared Khz |
| Block | CJK Compatibility |
| General Category | Other Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Square |
| Decomposition Mapping | "k" U+006B Latin Small Letter K "H" U+0048 Latin Capital Letter H "z" U+007A Latin Small Letter Z |
Encodings
| HTML Decimal Encoding | ㎑ |
| HTML Hex Encoding | ㎑ |
| UTF-8 Encoding | 0xE3 0x8E 0x91 |
| UTF-16 Encoding | 0x3391 |
| UTF-32 Encoding | 0x00003391 |
| C/C++/Java Escape | \u3391 |