The General Aptitude Test Battery measures 9 aptitudes, which are assigned alphabetical symbols:

Intelligence (G)
Verbal (V)
Numerical (N)
Spatial (S, ability to visualize objects and geometric forms)
Form perception (P, perception of visual details and differences)
Clerical perception (Q, perception of verbal, arithmetic, and tabular details)
Motor coordination (K, eye-hand-finger coordination)
Finger dexterity (F)
Manual dexterity (M)

Two aptitudes that the GATB does not test are Eye-Hand-Foot coordination (E) and Color discrimination (C).