116 and 616 roll film
The first “6” comes from “6 pictures per film”. Later versions were longer and 8 pictures would fit on the film but the name remained the same. This film format lasted up to 1984 when it was discontinued.
If you respool 120 film onto 116/616 spools, 120 film can be used with cameras designed for 116 and 616, as can 70mm film. When developing, remember to ask the lab for your 116/616 spools back or they’ll be thrown away.