You know! It's a thingummy... Whatjermercallit... The everyday items with the forgotten names Mail Online
My daughter always asks what the vertical indentation between the upper lip and nose is called.
Now I know - the Philtrum. The term derives from the Greek word philein, to kiss - for the ancient Greeks believed this area was one of the most erogenous spots on the body. Both Hitler and Charlie Chaplin covered theirs with a moustache- - while, apparently, SAS officers can kill someone simply by tapping-their philtrum in a certain way.