Inside screws

They are Robertson screws.  Klein makes a great 9 or 11 in one screwdriver that comes with 2 sizes of Robertson bits.  They are also commonly used for electrical work.  And I think they are used more in Canada than in the US for some reason.  You can pick up Klein tools at Home Depot or on Amazon.

TT

The reason Canadians use the square head screws, they are better than slot screws or phillips. Oh did I tell you it's a Canadian invention. 

For southerners south of the border and not really in the know they are sometimes called square drives. The screws used by FR and many other companies are #2 Robertson but your hardware store may know them as #2 square drives. Some screws are actually a double square which looks very much like, and are often confused with, a Torx (sometimes called star) but the Robertson will still fit.

Believe it or not, I'd never heard of the "Robertson" screw head. I've been using square drive screws for quite a while, I was just ignorant of the Robertson designation.

As for superior screw heads, I've been partial to the Torx head for a while now. 

In any case, there are a number of designs that are superior for the generic Philips head screw. I think one of the main distinguishing features is that the sides are straight up and down as opposed to slanted. The straight sided heads are much less likely to torque out.

I went to Lowes looking for a Robertson (square) screw driver. Lowes did not have one. Went to Home Depot and found exactly what I wanted. A number #1 with a common screwdriver handle. I brought a screw from my Pod to be sure of the fit. Problem solved.