- Handicap index
- The number that travels with you, kept by your golf association. It is not how many shots you get — it is the input. Halved stores it per golfer and turns it into a course handicap the moment you pick a tee.
- Course handicap
- How many strokes you get at this course from these tees: index × slope ÷ 113, plus course rating minus par, rounded. The same golfer is a 14 from one tee and a 17 from another, which is the whole point of rating a course.
- Playing handicap
- The course handicap after the game's allowance, and after an adjustment when the group is playing tees of different par. It is the number your strokes are actually dealt from.
- Allowance
- The percentage of handicap a game gives you — 90% of your playing handicap, say, rather than all of it. Lower allowances are common in four-ball because the best ball of two already flatters a side.
- Stroke index
- The 1 to 18 ranking printed on the card that says which holes are hardest, and therefore where strokes fall. A 12 handicap strokes on the holes indexed 1 through 12. Above 18 you stroke everywhere and twice on the hardest: an effective 23 is one shot a hole, and a second on indexes 1 to 5.
- Net
- Your score after handicap strokes come off. A 6 on a hole where you get a stroke is a net 5.
- Gross
- Your score before any strokes come off — what you actually wrote down.
- Strokes off the low man
- Instead of everybody playing their own net, the lowest handicap in the group plays to scratch and everyone else gets the difference. A 6, a 12 and a 20 become 0, 6 and 14. Common in match play, where what matters is the gap between you rather than each golfer's number.
- Net double bogey
- A cap on the damage: no hole counts worse than par + 2 + the strokes you get there. A triple on a hole where you stroke still scores as a double. Halved applies it at full net, where it is a handicap rule, and never in gross, where the board should show the card you really played.