What does +1 mean in Starcraft 2?

Question

I sometimes see terms like +1 thrown around for example Zealots. I kinda figured out it's related to upgrades but what upgrade? Protoss have melee, armor, shields and air weapons. Does +1 mean all of them?

Answer

When ever casters use the term +X/+X They are referring to the weapon upgrade first, then the armor upgrade next. In your example +1 zealots would be a regular zealot with +1 weapon upgrade with nothing else.

You'll often hear them say casters saying "They're going for a quick +1 timing attack" which means that the person researching the weapon upgrade is building an attack for when the weapon upgrade finishes, giving them a timing window/advantage over their opponent (assuming the opponent doesn't have any upgrades).

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