Apex hang
Also said as Hang time, Jump peak gravity
Gravity eases for a moment at the top of a jump, so the character hangs there briefly. It buys time to aim the landing.
The peak is where players make their decisions. A little extra time there makes the player feel more skilful and costs nothing in level design.
Say it
“Halve gravity while vertical speed is under 70 px/s and jump is held, so the peak gives players a beat to line up the landing.”
Where you’ve seen it
Celeste halves gravity at the peak of a held jump, which its creator says gives you more time to adjust and also looks pleasant.
Not to be confused with air control
Apex hang gives you more time in the air at the peak. Air control decides how much you can steer during that time.