Null symbol

Look up null or ␀ in Wiktionary, the free dictionary.

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