What does the symbol F_net mean in Coulomb's law problems?

[ssnapier]

I just need to know what I am being asked for here, I don't recall seeing this symbol before. Is this net force?

 

[SteamKing]

Looks like a capital theta, a letter in the Greek alphabet. No idea what it is supposed to represent, though.

 

[ssnapier]

Here is the lab worksheet, I think it is the angle of the force being applied on this electron. I have plugged in numbers that I think are right, just trying to make sure I understood what they were asking for here.