doodad

1. N-COUNT You can refer to something, especially an electronic device, as a doodad when you do not know exactly what is called. (尤指叫不出名的電子裝置)玩意兒[美國英語] [非正式]

Part of the attraction of photography is gadgets and mechanical doodads. 攝影術的吸引力部分在於它那些小裝置和機械玩意兒。