Just wondering
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Maybe it means 5.1.2.1 but they run out of their quota of dots.
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There’s a really obvious answer here but I’m not going to be crude…
“Fuzzy”.
–Eric
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Formula. It’s the racing game version. 
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final.
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fuhgettaboutit
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I believe it stands for “final”. The builds start out as early beta versions, going into RC (final) versions at the end of the development cycle. The final builds are marked with “f” to signify they are the final builds.
Float.
b = beta
rc = release candidate
f = final
actual release then has no letters
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Frak? Frell? Fogged-up? Frenchified? Fudged? Fhelp fme fout fhere!
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2f1 = 2 for 1. Two Unity’s for the price of one. Bargain.
I believe it’s code for the month. The f indicates the month, the number afterwards indicates the number of the patch.
f is like e for exponent but +1
Release 5.1.2f1 was neither on February nor on June (f is the 6th letter of the alphabet). 
In manufacturing it’s typically normal to obscure the actual month, no idea if it’s true at Unity or in software.
What would be the ideal way to check is to get each release number and compare that with the time of release. I recall having a p version a few months back.
p = perfect; without bug or flaw. Doesn’t happen very often.
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Six days ago actually…
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Okay, so it’s nothing to do with month. I’m now backing this idea, with p added for patch.
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