What are pincers?

No, its not. Pincers are usually found on crabs, scorpions, and creatures like this which have two pincers (like our hands) which they use for trapping pray to kill, and defence.

crabs and lobsters

Pincers are used to pick things up, particularly things which may be too hot to pick up by hand.

Many terms have been used historically, Chaka Zulu called it the horns and the bull, the modern term would be an envelopment. In the open a double envelopment like the "horns and the bull" is...

yes