sp2 Hybrids. The top three images show the three sp2 hybrids. These particular sp2 hybrids are combinations of 2s and two 2p functions. The bottom shows the relative positions of these three hybrids superimposed. Note that in each case, the nucleus is embedded in the minor lobe.
There are three sp2 hybrid orbitals. Each is the same as the other but one is rotated by 120° relative to the other. It is appropriate to invoke sp2 hybrid orbitals in molecules such as BF3 or H2C=CH2 (ethene) where the F-B-F and H-C-C angles are 120°, or nearly so.