Double Struck N Ary Summation

⅀ (Double Struck N Ary Summation) is a math symbol in Unicode’s Letterlike Symbols block. Its code point is U+2140, and it has been part of the standard since Unicode 3.2 (2002).

Select Copy symbol at the top of this page, then paste with Ctrl+V on Windows and Linux or ⌘+V on a Mac. On a phone, tap Copy symbol, then touch and hold where you want it and choose Paste. ⅀ pastes as ordinary text, so it works in documents, messages, and code.

In Microsoft Word, type 2140 and press Alt+X to turn the code into ⅀. In any app, open Character Map from the Start menu, search for “double-struck n-ary summation”, then select and copy the character.

Press Control+⌘+Space to open the Character Viewer, search for “double-struck n-ary summation”, and double-click the result to insert it.

The simplest way is to copy it from this page and paste it where you need it. If you use it often, save it as a text shortcut: on iPhone, go to Settings > General > Keyboard > Text Replacement; with Gboard on Android, go to Gboard settings > Dictionary > Personal dictionary.

Yes. ⅀ is a standard Unicode character, so you can paste it into Microsoft Word, Google Docs, emails, and posts or bios on Instagram, X, Facebook, and TikTok. In Google Docs you can also choose Insert > Special characters and search for “double-struck n-ary summation”. In Word, choose Insert > Symbol > More Symbols, set from to Unicode (hex), and enter 2140 as the character code.

No. ⅀ is a text symbol, not an emoji. It takes the color and size of the surrounding text, and its exact shape depends on the font.

An empty box or a question mark means the font on that device has no glyph for ⅀. The character is still there: it appears correctly wherever a font covers Unicode’s Letterlike Symbols block, and free font families such as Google Noto cover nearly all of Unicode.

In HTML, write ⅀ (decimal) or ⅀ (hexadecimal). In CSS, use content: "\2140"; in a ::before or ::after rule, and in JavaScript "\u2140". See all HTML codes.