The Term "vid"
'vid' is an acronym for Video Identification Number. The vid is a parameter that can be added to a Player Tag (embed code) and is used to inject a specific video into the player. Videos injected into a player using the 'vid' parameter will be played back before any existing player playlist.
Note: Not all player tag implementation use the 'vid' parameters, as most users can create players with playlist via the Portal.