Mario

A Mario Jump (mj) is a jump performed midair, which is possible by pressing the jump key after falling from a mario setup.

Mario Setups
Mario setups consist of small gaps, too small for the character to go through, but too large for its feet to touch the ground. Less consensually, you can also get stuck on the edges of many blocks and get a mario while falling: a part of the community conjecture that you could get a mario from any bloc.