I assume you mean Drive Letter. These are letters which are assigned to each drive in your computer, so it doesn't get them mixed up, and you always know which is which.
Push is a name that starts from letter P and ends with letter h for zoom your phone device.
instroment
A stabilator is a ten letter word for an aircraft's climb control device. A Beechcraft P35 Bonanza has such device which is a mix of a vertical stabilizer and an elevator.
Compass is a device that points north. It begins with the letter c.
chute
. . . . .Wedge
mailbox
inbox?
Piano
Rudder?
Microwave, microphone.
Ear