Tri-video, commonly referred to as Trivid, is a telecommunication medium used for displaying and transmitting sound with moving images in three dimensions through holographic displays and multiple speakers for stereophonic sound. It can refer to a trivid set (display and speakers), a trivid program (a show or video game), or the medium of tri-video transmission. Trivid is a mass medium used for entertainment, educational programming, news, advertising, and propaganda. Trivid sets come in different forms: