Self drilling screws have a drill bit point. Pan heads are slightly rounded with short vertical sides. Star drive is a Torx® compatible drive, designed to minimize the risk of cam-out (stripping).
A stainless alloy that is harder than 18-8 stainless steel, but not as resistant to corrosion.
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Flat heads are countersunk (cone shaped under the head) with a flat top. Spanner (a.k.a. snake eyes) is a tamper resistant drive that requires a special driver to install.
The most common stainless steel for general hardware use.