Plus Sign in Triangle ⨹

⨹ (U+2A39) 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: Plus Sign in Triangle is part of the Symbols family (block: Supplemental Mathematical Operators). 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 PLUS SIGN IN TRIANGLE, shown by the symbol U+2A39, is a specialized plus used in math and UI contexts. In the Supplemental Mathematical Operators block, it serves to indicate a specific type of addition or comparison that stands out from ordinary plus signs. Designers and mathematicians include this symbol when they want to mark a step that adds terms in a way that is distinct for readers or software. It can appear in formulas, annotations, or tooltips where a regular plus might be confused with other operations. While not as common as the standard plus, it has a clear role in complex equations and in interfaces that present algorithm steps or decision logic. The character is part of the Common script group, and it is recognized by math fonts and proof editors that support extended operators. Usage remains consistent: it signals a deliberate addition or positive change within a structured expression. People rely on such symbols to convey precise meaning quickly and without extra text.

Copy and input: the quickest method is to copy the character here. You can also insert it by its codepoint U+2A39 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.