The drawing, how to understand? Please help!

Hello,

I'm modeling a machine with solidworks, but I have a problem with one detail of a part, that is called "Screw".

I don't understand the head (Filled ractangular), how it should be represented in solidworks?

Is it just a head for "minus" screwdriver?

I'm attaching a file bellow.

SolidworksEducator Student