Suited / Offsuit (s / o)

Whether your two hole cards share a suit.

Written AKs and AKo. Suited hands have more equity because of the flush draws they make (10.9% on the flop), and their EQR is higher too. Offsuit hands cannot make flush draws, so their EQR is lower. For the same AK, AKs has 4 combos and AKo has 12.