Underscore Symbol (_)

Within this entry, Underscore Symbol refers to _. The verification value is U+005F LOW LINE, which remains authoritative across rendering differences. This page notes Calling underline formatting an underscore character and Adding spaces inside an identifier where the syntax forbids them; circle, plus, flower remain separate lookup entries. Representative material includes “file_name.txt”; “user_id”; “first_name”. It is intended for Plain text, Editorial writing, Identifiers and syntax, where nearby words or operands make the meaning recoverable. Web serialization should retain _ without visual substitution, including _ and _. The approved formatting approach includes Follow the identifier rules of the target system. It also includes Use CSS or document formatting for visual underlining. Preserve searchability and selection unless an image is essential. Review the title, examples, and local explanation before approving Underscore Symbol. That answer belongs to Underscore Symbol and should not be copied into an unrelated entry. The underscore symbol is _. _ is U+005F LOW LINE, commonly called underscore. It is used in identifiers, filenames, blanks, and plain-text conventions where spaces may be unavailable or disallowed. For Underscore Symbol, _ is encoded as U+005F, and its Unicode name is LOW LINE. Common uses for _ include Plain text, Editorial writing, Identifiers and syntax, File and path names. Add a readable label when Underscore Symbol could be misunderstood. Sample uses of Underscore Symbol include file_name.txt; user_id; first_name; snake_case_identifier. Preserve the full character or sequence when copying between apps. Avoid these common Underscore Symbol problems: Calling underline formatting an underscore character; Adding spaces inside an identifier where the syntax forbids them; Using repeated underscores as semantic HTML structure. Before final export of Underscore Symbol, Follow the identifier rules of the target system; Use CSS or document formatting for visual underlining; Preserve underscores in filenames, URLs, and code. Underscore Symbol on Windows: Use the key that produces _ on the active keyboard layout. Underscore Symbol on Mac: Use the key that produces _ on the active keyboard layout. Underscore Symbol on iPhone: Use the Copy button to copy _, then paste it into the target app. Save a text-replacement shortcut only if the exact sequence is preserved.