What does it mean when a girl rubs her legs against yours?

ok basically theres this girl that iv never "liked" but she is quite attractive anda verynice person. er day when we wher sitting in a group she kept putting her leg mine and kep touchingme, subtly. and then she starte ot around me, and the rest of the group granted. but then we started hanging out (with oher people) alot. what do youthink?