Mathematical Left White Square Bracket ⟦

⟦ (U+27E6) is a standard Unicode character that you can copy and paste anywhere text is accepted. This page provides a concise reference with safe tips, internal links, and practical guidance so you can use it reliably across apps and platforms.

What it is and where it’s used: Mathematical Left White Square Bracket is part of the Symbols family (block: Miscellaneous Mathematical Symbols-A). If you need styled or decorative alternatives, try our Fancy Text tool to generate compatible text that works in most modern interfaces.

History & usage: MATHEMATICAL LEFT WHITE SQUARE BRACKET (U+27E6) is a symbol in the Miscellaneous Mathematical Symbols-A block. It is a special bracket used in math and in some coding contexts. The symbol appears as a light, hollow square that opens a group. It helps show where a group of terms starts. In math, it marks the beginning of a set, an array, or a parameter list. In code, it can act as a delimiter for parameters or for quoted text in data and expressions. The symbol is not common in plain text writing, but it appears in specialized documents and math books. Users choose this bracket when they need a clear, distinct opening mark. It pairs with a corresponding closing symbol to enclose the group. The open square shape helps avoid confusion with round or curly brackets in dense formulas. Across fonts, the exact size and stroke may vary, but the function remains the same. When presenting formulas or code, this bracket signals structure and boundaries for readers.

Copy and input: the quickest method is to copy the character here. You can also insert it by its codepoint U+27E6 in many development tools or editors. Some operating systems provide a character viewer or input palette that lets you search by name or code and insert the glyph into documents.

Display and fallback: if you see an empty box (tofu) or a placeholder rectangle, the active font might not include this codepoint. Switching to a font with broader Unicode coverage or using a fallback font usually fixes the issue. On the web, ensure the page’s font stack includes a general‑purpose fallback.

Related references: browse the Categories for similar characters. When choosing a symbol, prefer the official codepoint for semantic clarity and better compatibility with search, copy, and accessibility tooling.

See our category page for related symbols.

Related confusable: view similar characters.