V-sign /ˈviː saɪn/ BrE AmE noun
1 . a sign made by holding up the first two fingers of your hand with the front of your hand facing forwards. During World War II it was used to mean victory, and it was used again by ↑ hippie s in the 1960s and 1970s to mean peace.
2 . British English a rude sign used to show that you are angry with someone or do not like them, made by holding up the first two fingers of your hand, with the back of your hand facing towards the person that you are insulting:
I gave the driver a V-sign.