A time code is a sequence of numeric codes generated at regular intervals by a timing system. Time codes are used extensively for synchronization.

'SMPTE time code' family of timecodes used in film, video and audio production:

Other related time and sequence codes: Time codes for purposes other than video and audio production:
  • IRIG time codes Used for military, government and commercial purposes.

See also: See also: References:
  • 'Timecode: A user's guide, second edition' by John Ratcliff, [Focal Press]
  • 'A Technical Introduction to Digital Video' by Charles Poynton