Traditional:
TRUE when HIGH count => 1 & LOW count => 1
Fun:
TRUE when each HIGH pin has only LOW neighbours.
Nightmare:
TRUE when HIGH count is even or odd (even-odd flag set at first use)
Broken:
TRUE when HIGH count is even XOR odd
We still have 4 more letters! No reason to stop there. (Joke aside: once doing chips at IBM I had to say, "You may not, under any circumstances, ask for a 9 input NOR gate.")