Attack matrix

attack matrix, n., D&Dism: in D&D, AD&D, and derivative games, tables used to determine to-hit rolls, by comparing opponent armor class versus the level of the attacker. Also combat tables.[GJ1]
----
Addendum #1: Dig up any old copy of the AD&D Dungeon Masters Guide. Place it on its spine and let it fall open. It will open to pages 74 and 75, if those pages haven't already fallen out from overuse -- the attack matrices. Some DMs were so good, they had memorized the combat tables. Scary, innit? [GJ1]
Addendum #2: Please note that the plural of matrix is matrices. Although it appears in some dictionaries, there is in fact no such word as "matrixes." [GJ1]