Left Square Bracket Extension ⎢

⎢ (U+23A2) 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: Left Square Bracket Extension is part of the Symbols family (block: Miscellaneous Technical). If you need styled or decorative alternatives, try our Fancy Text tool to generate compatible text that works in most modern interfaces.

History & usage: The LEFT SQUARE BRACKET EXTENSION is a symbol in the Miscellaneous Technical block. Its code point is U+23A2, and its script is listed as Common. In history, this and related bracket-like marks emerged to expand how writers and programmers group data. It helps distinguish embedded lists, parameters, or quoted text without crowding other punctuation. In practical use, it acts as a visible delimiter when traditional brackets are not enough or when a piece of text must stand out in a line. The symbol is treated as a textual tool rather than a math operator, so it appears in documentation, notes, or code comments where clarity matters. In coding contexts, it can mark the start of a parameter list or a special block that needs parsing by a reader or program. When combined with other brackets, it provides a clear boundary for separated parts. For writers, it offers an option to enclose phrases without interrupting the flow of the sentence. Overall, the symbol supports structure and readability in technical writing and code.

Copy and input: the quickest method is to copy the character here. You can also insert it by its codepoint U+23A2 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.