It depends on the server you're on.
On my server (Swiftsure) My team calls east and west. The pugs we have (some fail, some not) call left / right (the fails) and others call snow / grass (the not fails).
It just depends on how you understand. If someone calls left / right, i take it from how the minimap looks. If i'm wrong, then l2call out cardinal directions and make life easier.