Daniel "Danny" Zuko is one of the main characters in Grease. He's the leader - and possible founder - of the T-Birds. He's also the boyfriend of Sandy Olsson. Danny is portrayed by John Travolta in the 1978 film, by Aaron Tveit in the 2016 live performance.
Often times in film and television, a character has a hair style that is so iconic you always remember it as that character's signature look.
Upvote for Iconic, not for if the style was cool.