U+339A "㎚" Square Nm Unicode Character
Unicode Version 17.0
㎚
U+339A "㎚" Square Nm is a precomposed CJK compatibility ideograph that represents the square of the nanometer, a unit of length equal to one billionth of a meter, with the "n" and "m" characters arranged in a compact, square-shaped block. It belongs to the CJK Compatibility block of Unicode and was included primarily for compatibility with legacy East Asian character encodings, where such combined units were often used in technical and scientific contexts to denote nanomolar concentration or other nanometer-related measurements. While it is functionally equivalent to typing the letters "nm" separately, this single-character form ensures consistent visual alignment and spacing in documents that require precise rendering of unit symbols.
General Properties
| Code Point | U+339A |
| Version Added | 1.1 |
| Name | Square Nm |
| Unicode 1.0 Name | Squared Nm |
| Block | CJK Compatibility |
| General Category | Other Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Square |
| Decomposition Mapping | "n" U+006E Latin Small Letter N "m" U+006D Latin Small Letter M |
Encodings
| HTML Decimal Encoding | ㎚ |
| HTML Hex Encoding | ㎚ |
| UTF-8 Encoding | 0xE3 0x8E 0x9A |
| UTF-16 Encoding | 0x339A |
| UTF-32 Encoding | 0x0000339A |
| C/C++/Java Escape | \u339a |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Ideographic |
| East Asian Width | Wide |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "n" U+006E Latin Small Letter N "m" U+006D Latin Small Letter M |
| NFKC Simple Casefold | "n" U+006E Latin Small Letter N "m" U+006D Latin Small Letter M |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| Vertical Orientation | Upright |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Other |
| Sentence Break | Other |