Possible Clues:

• Winston Churchill flashed it
• Two fingers raised, e.g.
• Couples falling out of love use side-glance and disdainful gesture
• Two-digit display
• Something is vexatious about showing this?
• Double-digit display
• Obscene gesture
• Victorious gesture
• Very wrong to drink drop of Glenfiddich, a couple of fingers
• Two-finger peace gesture