Approach Angle
Anything which increases an aircraft's drag during descent will increase the glide/approach angle.
Angle is determined by the ratio of drag to lift.
Aircraft which land / approach below their minimum drag speed, such as an unflapped delta can readily increase their glide angle by raising the nose to increase angle of attack and hence drag.
The Mirage III delta is typical. Pilots get to know that a breif haul back on the stick will result in a ready means carving off excess height. An F111 with wings swept back is even worse requiring almost full power to stay on anywhere near a reasonable glide slope. Space shuttle worse again.
But NO NO NO to stalls at low level - you will end up in a crunched heap if you persist.