RicodJour ) said...

But you are right - they are known as Robertson screws, they are far
superior, and saying Square vs Robertson saves two syllables and lops a
third off of the word length. So let's just call them square drive
screws and call it even.

Those who use them regularly call them a Robbie. Colours (or "colors",
if you prefer) are used to distinguish the sizes:

A "red Robbie" is a #2, or if you go by screw size, a #8.
A "green Robbie" is a #1, or if you go by screw size, a #6.
A "yellow Robbie" is a #0, or if you go by screw size, a #4.
A "black Robbie" is a #3, or if you go by screw size, a #10.

Probably the least common, an "orange Robbie" is a #00, or if you go
by screw size, a #2.

--
Calvin Henry-Cotnam
"Never ascribe to malice what can equally be explained by incompetence."
- Napoleon
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