Null Symbol ␀

This entry treats Null Symbol as ␀. Its technical identifier, U+2400 SYMBOL FOR NULL, is the reference point for copying, searching, and comparing the symbol. The page should fail QA if Using NUL where ␀ is required changes the intended meaning of Null Symbol. It should also fail when Dropping part of U+2400 while copying null symbol. Similar or topical entries—empty-string-dfa, blank-space, command—are not automatic substitutes. Use them when checking display and interpretation in control-character documentation, debugging notes, encoding references. HTML output should reproduce ␀ exactly, including ␀ and ␀. The rendering step should respect In control-character documentation, define ␀ as Null Symbol before relying on the symbol alone. It should also respect For debugging notes, preserve the full encoded sequence U+2400; do not drop combining marks, superscripts, or component letters. For accessibility, describe the actual action, quantity, relation, or character name. The null symbol ␀ is U+2400 SYMBOL FOR NULL, a visible control-picture representation of the NUL control character. For Null Symbol, ␀ is encoded as U+2400, and its Unicode name is SYMBOL FOR NULL. Common uses for ␀ include control-character documentation, debugging notes, encoding references, protocol diagrams. Add a readable label when Null Symbol could be misunderstood. Sample uses of Null Symbol include NUL shown as ␀; Control picture ␀; Byte 00 → ␀; Display null ␀. Preserve the full character or sequence when copying between apps. Avoid these common Null Symbol problems: Using NUL where ␀ is required changes the intended meaning of Null Symbol; Dropping part of U+2400 while copying null symbol; Treating ␀ as interchangeable with ∅ without checking the domain convention. Before final export of Null Symbol, In control-character documentation, define ␀ as Null Symbol before relying on the symbol alone; For debugging notes, preserve the full encoded sequence U+2400; do not drop combining marks, superscripts, or component letters; In protocol diagrams, compare ␀ with NUL and choose the form whose meaning matches the source. Null Symbol on Windows: Copy ␀ from this page or enter the complete Unicode sequence U+2400 in a Unicode-aware editor. Null Symbol on Mac: Open Character Viewer with Control+Command+Space and search for the character name, or copy ␀ from this page. Null Symbol on iPhone: Tap the copy button for ␀, paste it into the target app, and save a text replacement when repeated use is needed.