A policy document by The Electronic Frontier Foundation (EFF) allows website owners to declare the implementation of ‘Do Not Track’ as a meaningful privacy opt-out of tracking, so that privacy-protecting software can better determine whether to block or anonymize communications with the website domain. This policy is intended first and foremost to be posted on domains that publish ads, widgets, images, scripts and other third-party embedded hypertext but it can be posted on any domain.
The privacy-friendly Do Not Track Policy is available here - https://www.eff.org/dnt-policy