Srikantha is a manifestation of Shiva. Srikantha means beautiful neck – the reference here is to the dark blue neck that Shiva got after drinking the halahala poison. Srikantha is also one of the ekadasarudras – 11 forms of Rudra Shiva.
There are also other references in Mahabharata regarding how Shiva got the name Srikantha. It is said that Indra hurled a thunderbolt on Shiva and it made a mark on his throat and he got the name.
Some ancient sculptors of Shiva as Srikantha depict him with five heads and 10 hands. Some sculptors give prominence to the blue throat.
Goddess Shakti is referred to as Srikanthardhasaririni – who is half the body of Srikantha (Shiva).