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What does SF stand for?

SF stands for Space Filler (philately)

This definition appears frequently and is found in the following Acronym Finder categories:

  • Slang/chat, popular culture

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We have 147 other meanings of SF in our Acronym Attic

Samples in periodicals archive:

The load specifies 1 1/4-ounce of BBs, and on the top of the deconstructed loads were several light plastic discs we presume to be space fillers put there to make sure the payload occupies every available bit of space, and ensuring the interplay between the crimp and initial ignition vital to the consistent performance of this load.
But the rest -- anthropomorphic animal bits that go nowhere, carpentry slapstick that's about as sophisticated as hitting a thumb with a hammer -- is just space filler.