0

0 may refer to:


 * , a number, glyph, and Hindu-Arabic numeral
 * The whose value is zero for every element in its domain
 * glyph used to distinguish the number '0' from the letter 'O' on character displays (see also the letter )
 * , also known as a "zero"
 * The telephone number dialed in the to reach the  at the user's, as opposed to dialing  for the  operator.
 * The telephone number dialed in the to reach the  at the user's, as opposed to dialing  for the  operator.