“Q” is for the Olympus Quickmatic, a camera for 126 cartridge film.
While Kodak had the Instamatic, Olympus responded with the Quickmatic.
We have two Quickmatics in our collection.

Both Quickmatic here were manufactured in 1967. The EES has a hot shoe for the flash.

The Quickmatic EEM lacks the hot shoe. Both cameras employ zone focusing, rather than a coupled rangefinder or through-the-lens focusing.

Reference: McKeown’s Price Guide to Antique and Classic Cameras, 12th edition, ISBN 0-931838-40-1
The other cameras featured in this A to Z Challenge are linked on this page.