A "Mechanical Trade" is a term originally coined by BigToke on CTTV earlier this year. There is also another entry type dubbed "Camo Entry" that can sometimes be used in conjunction. This strategy is based on the Hidden Pivot Method by Rick Ackerman. The following chart is an example of a mechanical short, for which the inverse of can be applied for a mechanical long. There is also a video below where BigToke goes over these strategies.

Mech Stategy "Cheat Sheet" by BigToke

Mech & Camo Overview by BigToke