wire on the floor. What is it likely was used for?
It appears that there is a drain for the washing machine coming out of the wall, and the drier vent is right next to it, so I think it is more likely that it went to a washing machine. Since there is no plug on the wire, it may have been hardwired.

Try to trace the wire back to the panel to see if anyone labeled it. Also, make sure that the circuit is dead before touching it.