Base Attack Bonus

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A base attack bonus is an attack roll bonus derived from character class and level or creature type and Hit Dice (or combinations thereof). Base attack bonuses increase at different rates for different character classes and creature types. A second attack is gained when a base attack bonus reaches +6, a third with a base attack bonus of +11 or higher, and a fourth with a base attack bonus of +16 or higher. This trend continues to a maximum of six attacks at +26.

Base attack bonuses gained from different sources, such as when a character is a multiclass character, stack.

Creature Basics
Combat	Hit Die Hit Points Base Attack Bonus Armor Class
Attributes	Strength Dexterity Constitution Intelligence Wisdom Charisma
Saving Throws	Fortitude Reflex Will
Progression	Character Level Caster Level
Character	Alignment Race