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The 312 designation means that it is a 312 series fuse made by a company called Littelfuse. This is a series of fast acting, glass cartridge fuse. Knowing the series allows you to look up the exact specifications for the fuse at the company's website. The fuse would have a rating impressed into one if the steel caps that looks like: 250V 312 5A Indicating it is a 250 Volt, 5A fuse, and is a Littelfuse 312 series, which implies fast acting, specific performance specifications and its size (31.75+/- 1.12mm x 6.25 +/- 0.3mm).
Typically the "F" stands for "Fast Blow" or "Fast Acting". A "T", as in T6A, would mean "Time Delay" or Slow-Blow. So, an F6A 250 is a Fast Acting (Fast Blow) 6 Amp 250 Volt Fuse.
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"They are circles."
squares and circles
to turn around in circles
Nothing
drawing Circles
Automobile Glass fuse
slow fuse
Fast Acting Fuse
Circles=Warm fronts Triangles=Cold fronts Fronts=where two air masses meet air mass=large region of air that has similar temperatures and humidity throughout