V-sign
Concise Oxford English Dictionary © 2008 Oxford University Press:
V-sign
▶noun
- 1 Brit. a sign resembling the letter V made with the first two fingers pointing up and the back of the hand facing outwards, used as a gesture of abuse or contempt.
- 2 a similar sign made with the palm of the hand facing outwards, used as a symbol or gesture of victory.
'V-sign' also found in these Oxford entries:

