The name ASL stands for American Semi-Longbows. At one time, these longbows were just called straight-limbed longbows which I find better is a much better term for the bow. The reason I say this is, I have come across shooters saying they're shooting an ASL and it's a Bear Montana Longbow which has a slight R/D in the limb.
Now, as most of our members know a straight-limbed bow can be straight, reflex or stringfollow but it's not a reflex and deflex limb.
If you come across someone saying they're shooting an ASL and the bow has R/D in the limbs, educate them on what's the difference between a straight-limbed and R/D.