What did their longwell-oiled hair symbolize to the greasers?

For the greasers in S.E. Hinton's "The Outsiders," their long, well-oiled hair symbolizes their identity and defiance against societal norms. It represents their brotherhood, pride, and a sense of belonging within their group, distinguishing them from the more affluent Socs. The care they put into their hair reflects their desire to maintain a distinct image and a sense of self-worth in a world that often marginalizes them.