- Approach
- The overall strategic framework a player uses across a match - e.g., random baseline, aggressive reading, or gambit-based play.
- Avalanche
- A gambit consisting of three consecutive Rock throws (R-R-R). Named for its crushing intent. Effective against opponents who expect variety.
- Best of 3 (Bo3)
- A match format where the first player to win 2 rounds wins the match. The standard format for most casual and competitive play.
- Best of 5 (Bo5)
- A match format requiring 3 round wins. Used in semifinals, finals, and high-stakes competitive matches to reduce variance.
- Bureaucrat
- A gambit of three consecutive Paper throws (P-P-P). Named humorously for its "papering" everything.
- Bye
- An automatic advancement in the first round of a tournament bracket, given when the player count isn't a perfect power of 2.
- Cadence
- The rhythm of the count before a throw. The WRPSA standard is "Rock… Paper… Scissors… Shoot!" with the throw on "Shoot."
- Counter
- The throw that beats your opponent's expected throw. If you expect Rock, your counter is Paper.
- Crescendo
- A gambit that escalates: Rock, Paper, Scissors (R-P-S). Follows the natural sequence of the game's name.
- Double Elimination
- A tournament format where players must lose twice to be eliminated. Includes a winners' bracket and losers' bracket.
- Fistful o' Dollars
- A gambit of Rock, Paper, Paper (R-P-P). Opens with Rock to test the waters, then doubles down on Paper.
- Foul
- An illegal action during a throw: late throw, ambiguous gesture, or intentional obstruction. Results in a warning or loss of round.
- Gambit
- A pre-planned sequence of three throws used in a Bo3 match. Removes in-the-moment emotional decisions by committing to a plan in advance.
- Jan-ken-pon
- The Japanese name for Rock Paper Scissors (じゃんけんぽん). Japan standardized the three modern gestures we use today.
- Late throw
- Revealing your gesture after seeing your opponent's. A foul in competitive play. Requires simultaneous reveal.
- Lizard Spock
- A five-gesture RPS variant adding Lizard and Spock. Reduces tie rate from 33% to 20%. Popularized by The Big Bang Theory.
- Markov model
- A mathematical/AI technique that predicts the next throw based on the sequence of previous throws. Used by AI opponents.
- Meta-game
- The strategy of anticipating your opponent's strategy. "I know that you know that I know" reasoning. Critical at high levels.
- Nash equilibrium
- The game-theory optimal strategy for RPS: throw Rock, Paper, and Scissors each with exactly 33.3% probability. Unexploitable but also unexploiting.
- Paper
- One of three legal throws. Formed with an open flat hand, fingers together. Beats Rock (covers it), loses to Scissors (cut by it).
- Pattern tracking
- Mentally recording an opponent's throws across rounds to identify exploitable tendencies - e.g., always switching after a loss.
- Priming
- Using verbal or body cues to subtly influence an opponent's throw choice. E.g., saying "rock solid plan" before a match. Not illegal but considered gamesmanship.
- Random baseline
- Playing with genuine randomness (33/33/33). The defensive foundation of competitive RPS. Effective against unknown opponents.
- Read
- Predicting what your opponent will throw based on pattern analysis, tells, or psychological tendency. A correct read wins the round.
- Referee
- An official who oversees a competitive match, ensures simultaneous throws, resolves disputes, and records results.
- Rock
- One of three legal throws. Formed with a closed fist. Beats Scissors (crushes them), loses to Paper (covered by it).
- Rock bias
- The statistical tendency for players to throw Rock more often (~36%) than expected, especially on opening throws. Rock feels "safe" and "strong."
- Roshambo
- An alternate name for Rock Paper Scissors, commonly used in North America. Possibly derived from a French name but etymology is disputed.
- RPS
- Abbreviation for Rock Paper Scissors.
- Scissors
- One of three legal throws. Formed with index and middle fingers extended in a V. Beats Paper (cuts it), loses to Rock (crushed by it).
- Seeding
- Placing ranked players in a tournament bracket to prevent top competitors from meeting in early rounds.
- Shoot
- The moment of reveal. In the WRPSA standard count ("Rock… Paper… Scissors… Shoot!"), players show their throw on "Shoot."
- Single elimination
- A tournament format where one loss eliminates a player. Fast, dramatic, high-stakes.
- Swiss system
- A tournament format pairing players with similar records each round. Efficient for large groups without elimination.
- Tell
- An unconscious signal that hints at an opponent's intended throw - e.g., slight finger movement before revealing Scissors.
- Throw
- The hand gesture revealed during play. The three legal throws are Rock, Paper, and Scissors.
- Tie
- When both players reveal the same throw. The round is replayed. Also called a "draw" or "push."
- Tilt
- Emotional frustration that leads to predictable, suboptimal play. Usually triggered by a string of losses.
- Toolbox
- A gambit of three consecutive Scissors throws (S-S-S). The riskiest pure gambit - devastating when it works.
- Variant
- Any modification to classic 3-throw RPS: Lizard Spock (5 throws), RPS-7, RPS-25, Bear Ninja Cowboy, etc.
- WRPSA
- World Rock Paper Scissors Association. Founded 2015. The governing body for competitive RPS: rules, rankings, tournaments, and promotion.
- WSLS (Win-Stay, Lose-Shift)
- The most common and exploitable human pattern: repeating a winning throw and switching after a losing throw. Recognizing and countering WSLS is a foundational competitive skill.
