Her name comes from the upgraded version of Nine-ball, Nine-ball=Seraph. She is universally depicted as Cirno with Nine-ball's red and black color scheme, and usually the back thrusters of either version of Nine-ball. She is sometimes drawn wielding Nine-ball's weapons and wearing a helmet modeled after Nine-ball's head.
Nineball=Cirno is a result of the similarities between Cirno and Nine-ball: Cirno is the (self-proclaimed) strongest, Nine-ball actually held the status of strongest, and they both have a connection to the number 9.
She may be known by some for the M.U.G.E.N character based off the idea.
