Gestures
From Space Engineers Wiki
Gestures are discrete animations that can be bound to the Toolbar and played at will. By default, the game comes with a handful of gestures that can be used to communicate with other players, including a wave, facepalm, thumbs-up, and others. See Toolbar Config to see how to select your gestures, or see List of Mods for gesture mods that can be added to the game.