The most common are FH = flat head, PH = pan head, and OH = oval head
A #5 is a little uncommon, it might be a misprint and if so I would guess on a #6 BTW the range is from #0 to a #24 the common ones for assembly are #6, #8, #10 and #12. Size of #4 and below are often used with mounting hardware (hinges etc).
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