What are the heels with red soles called?

There are currently many designers who use the red sole.

One of the first designers to use the red sole was Christian Louboutin.

He began using a red lacquered sole in 1992.

Marc Jacobs, Louis Vuitton, Yves Saint Laurent, Manolo Blahnik and many others use the red sole now, but it was originally used by Mr. Louboutin.