“Ortholinear” is a made up word for “put all the keys in a fixed grid because hey it’s easy” (“orthos” was the Greek word for “straight”, “linea” was Latin for

“Ortholinear” is a made up word for “put all the keys in a fixed grid because hey it’s easy” (“orthos” was the Greek word for “straight”, “linea” was Latin for “line”). “Vertical stagger” means that the keys are arranged in columns instead of rows, but the columns are staggered to match the resting position of the various fingers.