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[kurto]

You won't necessarily find those abbreviations in a poker book. They're actually abbreviations based on Pokertracker ratings and terminology common to this site.

They refer to Tight vs Loose (or sL Slightly Loose)
The A (or AG)/P refers to Aggressive vs. Passive.

A SLAG is slight loose (preflop) Agressive (post flop)

If you see 3 (with no G) ie TAA... Means Tight (preflop) Aggressive (preflop) and Aggressive (postflop) -- This is the theoretical ideal.

A TPA would mean Tight preflop, Passive preflop (limps a lot) and Aggressive postflop.

A "calling station" is someone who's very loose preflop, very passive pre and postflop AND who goes to showdown too often.

A maniac is someone who's Loose Preflop/overly aggressive preflop/aggressive on the flop.