title: Null symbol
text: # Null symbol
  
  Null symbol may refer to:
  
  * Null character, U+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
  