Gesture from Victor and Leo, say (1-4)

I believe the answer is:

v-sign

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But I can't explain it at all! Could you help me understand?

(Other definitions for v-sign that I've seen before include "Gesture (from Winston or Harvey?)" , "Victory token" , "Offensive gesture" , "number 5 for Julius Caesar" .)

I've seen this clue in The Telegraph.

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