Null symbol

Null symbol may refer to:

• Null character, U+0000 <control-0000>, U+2400 ␀ SYMBOL FOR NULL (a single-character glyph "NUL")
• Null sign (∅), the empty set
• Null (SQL) (ω), a special marker and keyword NULL in SQL
• Empty string (λ, Λ, or ε), in formal language theory

See also

• Null (disambiguation)
• Ø (disambiguation)
• Dotted circle – Non-significant typographic character (U+25CC ◌ DOTTED CIRCLE)