Symmetrical wings
Just to be bloody pedantic:-
symmetrical wings in the Pitts family are not truly symmetrical - they are far closer to being symmetrical than the flat bottomed (M6) aerofoil but they are actually designed to fly similarly either way up - the nose attitude S&L inverted is still slightly higher than erect S&L.
Symmetrical ailerons in the same family are to all intents perfectly symmetrical!
I know that this doesn't really help much but it is a fuller picture!
Stik