I can see where the Posidrive may be used in some electronic equipment,
but all of the screws in the hinges in my house, as well as the screws
holding the locks on the doors, are definitely Phillips. Are Posidrive
screws used for those applications in other countries?
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Most wood screws in (at least)western Europe are now posidrive ,because
the grip is so much better ,which is necessary due to the frequent use
of electric screwdrivers.

A tool company Draper are selling chromium-vanadium steel screwdrivers
in sets with coloured plastic grips (in the UK)
A set comprises 3x3 ,total of 9 screwdrivers
Flat blade : Red grip
Phillips : Blue grip (or is it Philips?)
Posidrive : Green grip

Frank GM0CSZ / KN6WH