Found 6 symbols starting with SL:

Slash
The slash (/) is a sign used as a punctuation mark and for various other purposes. It is often called a forward slash (a retronym used to distinguish the slash from the backslash, "\"), and many otheā€¦
Sleep for the night
French hobo sign- where this appears it means that you can sleep for the night at that location.
Slightly Smiling Face (Apple iOS 10.3)
Slipknot logo
Logo and symbol of the US-based metal band, Slipknot.
Slow Down
Take it easy, Relax or Slow down
Slytherin House
The emblem of Slytherin House of Hogwarts School of Witchcraft and Wizardry.