How can you remember right runway from left?

I hear it alot in the ATC on flight sims... it will say 'runway 27L' or something... but how do you know if it is left or right when you are flying towards it?
Is it just the way that the aircraft take off in relation to the ATC? So 27L is taking off going from R to L of the tower... and vice versa
?
cheers
Is it just the way that the aircraft take off in relation to the ATC? So 27L is taking off going from R to L of the tower... and vice versa

cheers