is a video by Meatsleep. The video is five seconds long, and it was released on 3 October, 2015. The video was deleted within minutes of its publication.


The video shows a dark grey screen with ambient noises in the background.


The title of the video is known as an Empty Set. The symbol was based on the Norwegian letter O with a stroke (Ø).

This video set the precedent for many videos to follow, including CRllIVJB-jU and 箴言 十三 四.