The mixing of atomic orbitals is called hybridisation.

Hybridisation (biology) the process of combining different varieties of organisms to create a hybrid

It's a sp2 hybridisation.

sp3- tetrahedral- note that geometry of molecules indicates hybridisation NOT hybridisation indicates geometry

carbon can have either sp3 ,sp2 or sp1 hybridised orbital depending upon the type of hybridisation hybridisation influences the bond and bond therapy (strength) in the organic compounds