register key
Sign in to saveAlso known as twelfth key
thumb key on a clarinet to raise the pitch a twelfth into the high register
In the Vinony graph
Vinony's link graph records 10 inbound references to register key, and connects out to saxophone, oboe and bassoon.
Vinony files it under Clarinets, Saxophones and Woodwind instrument parts and accessories.
Vinony links it to 6 Wikipedia language editions.