Equal to by Definition ≝

≝ (U+225D) 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: Equal to by Definition is part of the Symbols family (block: 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 symbol equal to by definition appears with the code point U+225D in the Mathematical Operators block. It is used to mark what something is defined as. In history, researchers created this mark to show that a statement is true by definition, not by proof. It helps writers keep a clear line between facts and accepted definitions. In practice, the symbol is used in formulas and in user interfaces. It signals that a result follows directly from a definition. People place the symbol where a term is set equal to its defined value. The form is compact and easy to read in math text, textbooks, and software inputs. In Unicode, U+225D identifies this exact symbol so fonts can render it consistently. The usage is limited to contexts involving definitions, a common case in math and logic. Many common math symbols indicate operations or comparisons in formulas and user interfaces. Keeping this symbol distinct helps avoid confusion with other equality signs. Overall, it supports precise definitions and clear communication in math materials and applications.

Copy and input: the quickest method is to copy the character here. You can also insert it by its codepoint U+225D 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.