electronic symbol electric iec connection circuits Rsa Iec Connection Symbol clip art 連接 符號 電路 Rsa Iec 連接子號剪貼畫
there is a lot going on in this picture. there are 4 triangles and 2 hexagons. In the middle it appears to be a dodecagon. 費解 連接 六角 令人費解的連接