π Stop Sign is one of the animated emoji in Google's Noto Emoji Animation set β the same stop sign emoji (U+1F6D1) drawn as a short looping Lottie animation. Lottie files are vector, so the animation stays sharp at any size and is usually much lighter than a GIF or a video.
π is the stop sign emoji, part of Unicode's Travel & Places group, added in Emoji 3.0 (2016). Unicode's keyword list links it with βoctagonalβ.

