LEGO 553c 4216652 White Brick, Round 2 x 2 Dome Top - Hollow Stud with Bottom Axle Holder x Shape + Orientation | electricBricks : LEGO set and parts shop and database
Flix-Brix.de - LEGO® Ersatzteile, Einzelsteine, Minifiguren und Sets (FlixBrix)
Such a dramatic name for a piece like this (from the lego bricks & pieces page) : r/lego