On film sets a 'C-47' refers to which of these common household items?

On film sets clothespins are referred to as C-47's. They are used for anything from clamping gels over lights to attaching script pages to a stand for easy access.

There are a bunch of stories explaining the origin of the name. One has it that C-47 refers to an extremely versatile type of military plane used during World War II. Because clothespins are also versatile in film production, they were honored with the name by returning servicemen.

Another story suggests that C-47 was simply a catalog number for a bag of clothespins (or, in an alternate version, a World War II requisition number). A third is that a particular movie studio stored clothespins in a bin marked C-47 and the name just stuck. A fourth, 'C-47' was the patent number for a clothespin (unlikely).

A more interesting story, (considered the most accurate), is that back in the early days of Hollywood, studio heads auditing equipment requests from lighting departments would go crazy over the idea of spending good money for something as simple and mundane as clothespins. Hence, “clothespin” was quietly changed to the far more impressive sounding C-47 and all requests were immediately approved.