U+3390
Hertz㎐
Hertz is a monochrome text character from the Unicode CJK Compatibility block, listed here under Units & Measurements. Copy it with one click, or use the hex, octal, decimal and HTML entity codes below to embed it in web pages, code, and documents. It is often searched for as "hz", "frequency", "unit".
Quick facts
- Unicode
- U+3390
- Decimal
- 13200
- Hex
- 0x3390
- Octal
- 0o31620
Unicode identity
| Format | Value | Copy |
|---|---|---|
| Code pointOfficial Unicode notation | U+3390 | |
| Official nameUnicodeData.txt, Unicode 18.0.0 | SQUARE HZ | |
| Unicode 1.0 nameLegacy alias | SQUARED HZ | |
| DecimalBase 10 | 13200 | |
| HexadecimalBase 16 | 0x3390 | |
| OctalBase 8 | 0o31620 | |
| BinaryBase 2 | 0011001110010000 | |
| General categorySymbol, other | So | |
| Unicode blockU+3300–U+33FF | CJK Compatibility | |
| Plane | Basic Multilingual Plane (BMP, Plane 0) |
HTML & CSS
| Format | Value | Copy |
|---|---|---|
| HTML entity (decimal) | ㎐ | |
| HTML entity (hex) | ㎐ | |
| CSS content escapeUse inside content: "…" | \3390 | |
| URL encodedPercent-encoded UTF-8 | %E3%8E%90 |
Programming languages
| Format | Value | Copy |
|---|---|---|
| JavaScript / TypeScript | \u3390 | |
| JSONUTF-16 surrogate pairs | \u3390 | |
| Python | \u3390 | |
| Java / C# / Kotlin | \u3390 |
Byte encodings
| Format | Value | Copy |
|---|---|---|
| UTF-83 bytes | E3 8E 90 | |
| UTF-16 (BE) | 3390 | |
| UTF-32 (BE) | 00003390 |
How to type Hertz
Windows
Hold Alt and type +3390 with the hex numeric keypad option enabled, or type 3390 then press Alt+X in Word and most Office apps.
macOS
Enable the Unicode Hex Input keyboard, hold Option, and type 3390. Or open Character Viewer (Control+Command+Space) and search "Hertz".
Linux
Press Ctrl+Shift+U, type 3390, then press Space or Enter in GTK apps. IBus and most terminals support the same sequence.
HTML, CSS & code
Paste the character directly, or use the escapes above: ㎐ in HTML, \3390 in CSS, and \u3390 in JavaScript.
Official Unicode reference
- Character name
- SQUARE HZ
- Unicode 1.0 name
- SQUARED HZ
- Block
- CJK Compatibility (U+3300–U+33FF)
- General category
- So — Symbol, other
Data from the Unicode Character Database, version 18.0.0. See the official code chart for the CJK Compatibility block: U3300.pdf (PDF, unicode.org).
Frequently asked questions
How do I copy the Hertz symbol?
Click the Copy button at the top of this page, or select ㎐ and press Ctrl+C (Cmd+C on Mac). It is plain Unicode text, so it pastes into documents, chats, code, and design tools.
What is the Unicode code point for Hertz?
Hertz is U+3390 (decimal 13200, hexadecimal 0x3390, octal 0o31620). It lives in the CJK Compatibility block (U+3300–U+33FF) of the Basic Multilingual Plane (BMP, Plane 0).
What is the official Unicode name of Hertz?
The Unicode Standard (version 18.0.0) names this character "SQUARE HZ"; its Unicode 1.0 name was "SQUARED HZ". Its General_Category is So (Symbol, other).
What is the HTML code for Hertz?
Use ㎐ or ㎐. In CSS, use content: "\3390".
How do I type Hertz in code?
JavaScript: "\u3390". Python: "\u3390". JSON and Java: "\u3390". The UTF-8 byte sequence is E3 8E 90.
Is Hertz an emoji?
No. Hertz is a text symbol and renders as a monochrome glyph in the current font. Some platforms may offer an emoji variant when U+FE0F is appended.