Gambling terms, explained straight

Online Gambling & Industry

RNG meaning luck

In slots, RNG meaning luck is the shorthand way of saying that a random-number generator, not player skill, decides each spin's outcome.

Applies to
Slots and other reel-based casino games where the outcome is determined by RNG4
UK regulation
Gambling Commission requires RNG output to be uniformly distributed, unpredictable, and non-repeating35

Key points

  • The RNG is hardware, software, or an algorithm that generates statistically random slot outcomes.4
  • The UK Gambling Commission describes slots as "100% random and luck based."2
  • "Random" in this context usually means pseudo-random, not truly random.1

Where this term is used

Online RNG meaning Covers the abbreviation itself and its general use. Online RNG certified meaning Explains what it means for a game's RNG to be certified. Online UKGC licence A UKGC licence is an operating licence from the UK Gambling Commission Online Crypto casino A crypto casino is an online gambling venue Online KYC meaning KYC stands for Know Your Customer Online Gambling commission A gambling commission is a fee or charge deducted by an operator or intermediary from a stake

Sources

  1. How can gaming machines meet their %RTP if they are ... gamblingcommission.gov.uk Provides the statement that RNG output is pseudo-random and that slots are luck-based.
  2. Online games design and reverse withdrawals gamblingcommission.gov.uk States that slots are '100% random and luck based'.
  3. Regulatory returns guidance - 2 - Random number ... gamblingcommission.gov.uk Details the regulatory requirements for RNG uniformity and unpredictability.
  4. Remote gambling and software technical standards (RTS) - 2 gamblingcommission.gov.uk Defines RNG as the hardware/software that generates slot outcomes.
  5. Guidance to licensing authorities - RTS 7 – Generation of ... gamblingcommission.gov.uk Specifies that RNG output must not cycle or synchronise between instances.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.