two fingers

Từ điển Oxford Advanced Learner 8th

ˌtwo ˈfingers f8 [two fingers] BrE NAmE noun plural (BrE, informal)
a sign that you make by holding up your hand with the inside part facing towards you and making a V-shape with your first and second fingers (used as a way of being rude to other people)
•I gave him the two fingers.
compare ↑V-sign