ピース
ぴーす
noun
piece; peace sign (V-sign)
1.
peace sign, V-sign
The two-finger V-sign, above all when posing for photos (also ピースサイン). On its own, ピース does not mean peace as a state; that is 平和.
Usage
Sense 1 is most commonly used in ピースサイン or simply ピース (the V-sign gesture). In Japan, holding up two fingers in photos is ubiquitous and is called ピース.
Sense 2 is used for individual components, especially puzzle pieces. Also used as a counter-like suffix for sliced items (ケーキを二ピース = two pieces/slices of cake).