doohickeys
doo-hick-eys
noun
An informal term for a small, often mechanical, object or gadget whose name is unknown or forgotten.
"Could you pass me that little doohickey from the toolbox?"
Thesaurus
Synonyms: thingumajig, gizmo, whatchamacallit, whatsis, thingummy, widget, dojigger, whatchamacallum, thingamabob, doodad, gubbins, thingumabob