Casino and slots

TermWriteAvoidMeaning
RTPRTP of 96.5%Rtp, R.T.P., 96,5 %Theoretical return over the long run
Volatilityhigh volatilitymixing with “variance” in one textHow big and how rare wins are
Free spinsfree spinsfreespins, free-spins, FSSpins without deducting a stake
Wagering35x wageringwager 35, x35 WRHow many times a bonus must be played through
Cashbackcashbackcash back, cash-backA refund of part of the losses
Jackpotprogressive jackpotJackpot mid-sentenceAn accumulating top prize
Live casinolive casinoLive Casino mid-sentenceGames with a real dealer
Bonus buybonus buy featurebonusbuyPaying to enter the bonus round

Note the x in wagering: “35x” means “35 times”. Pick one order (35x or x35) for the whole project and never mix them.

Betting

TermWriteAvoidMeaning
Oddsodds of 1.85mixing decimal and fractionalChoose the format your market uses
Accumulatoraccumulator (acca) / parlayboth in one text“Acca” for the UK, “parlay” for the US
Free betfree betfreebet, free-betA free stake from the bookmaker
Over/Underover 2.5 goalsO2.5 without explanationSpell it out on first mention
Handicap−1.5 handicap-1.5 (hyphen instead of minus)Use the real minus sign “−”
Cash OutCash Out (feature), cash out (verb)cashout, cash-out mixedSettling a bet early
Marginbookmaker margin of 5%“juice” in formal copyThe commission built into the odds

Number formatting

  • Decimal separator: a point — 96.5%, 1.85.
  • Thousands: a comma — €10,000.
  • Currency symbol before the number, no space: €500, $20.
  • Ranges: an en dash without spaces — €10–20.
  • Percent sign: no space — 100%.

Tip: put these rules into your project style guide — writers will make fewer mistakes, and proofreading will get faster and cheaper.