The number of correct answers amazed me! I thought this was one of the most obscure gadgets I ever used, yet almost 50 people knew what it was. Brett not only knew what it was, but where to buy it!  Out of all the right answers we picked six, mostly at random.

It’s a wire splicing connector. –Brett Glas
https://www.wago.com/us/wire-splicing-connectors/splicing-connector/p/222-412

It’s an electrical wire connector. Martin

For splicing wires – Allen S

Lever Action wire connector – David Sjodin

WAGO LEVER-NUT® Connector, 2-Conductor, 222-412. Mr Tom

Electrical connector used to hold together two wires without soldering then and can be reused a number of times. Richard zanfini

To learn how to get your prize please read the description under the ‘cute, clever, could be’ section below.