Cool is the time between the ending of the attack and the beginning of another.
Attack Mod is the Damage modifier for each level of upgrade.
Gnd is Ground attack for units with split Air/Ground Weapon Systems
Air is Air attack for units with split Air/Ground Weapon Systems
Upg is a stat change after getting an upgrade

Red indicates that the information is specific to StarCraft Brood War.

Towers such as the Photon Cannon have a detection range of 7. Mobile detectors such as the Observer have a detection range of 11. This is independent of sight range.

Attacks:

E indicates Explosive Attack (50% damage to Small Units 75% damage to Medium Units, full damage to Large Units).
C indicates Concussive/Plasma damage Attack (50% damage to Medium Units 25% dam to Large Units).
S indicates Splash damage, which affects all units in the blast area.

Notes:

B indicates Biological
D = Unit can Detect Cloaked/Burrowed units
SA = Unit has one or more Special Abilities (is a spell-caster)
T = Transport
W = Worker