Pure sequence
Three or more consecutive cards of one suit with no joker standing in. Example: 5♥ 6♥ 7♥. Required in a standard 13-card declaration.
Impure sequence
A run that uses a joker as a missing rank. Useful, but it does not replace the pure-sequence requirement.
Set (book)
Three or four cards of the same rank in different suits, such as 8♥ 8♠ 8♣. Two copies of the same suited rank are not a set.
Joker
Printed joker or a wild rank selected each deal. Jokers have 0 points when grouped; they cannot make a pure sequence.
Drop
Leaving the deal before a declaration. First drop and middle drop carry different penalties — see Scoring.
Declare
Showing a completed 13-card grouping. An invalid declare is usually punished at the maximum score.
Discard / open pile
The card thrown at the end of a turn. Some tables restrict picking a discard you just threw.
Closed deck
The face-down stock. Drawing from here versus the discard changes what opponents can see.
Deadwood
Ungrouped cards that still count against you when someone else declares.
Points Rummy
One-deal format. Result is points × stake for that hand only.
Pool Rummy (101 / 201)
Multi-deal format. Stay below the score limit; the number is the elimination threshold.
Deals Rummy
A session with a fixed number of deals and one overall result.
KYC
Know Your Customer checks (name, PAN, sometimes a video) required before the first withdrawal on most Indian apps.
Wagering
Play-through attached to a welcome bonus before that credit joins the withdrawable wallet.