18+ only; R-18; adults only
Indicates content or products restricted to those 18 years or older, similar to an age rating. Common in media, games, and online platforms.
This game is 18+ only, so I can't buy it for children.
An 18+ only mark was displayed on the site.
Common abbreviation using Arabic numeral; widely used in online contexts and product labeling.
Kanji spelling; less common but still seen, especially in formal or traditional contexts.
Abbreviation of 十八 (18) and 禁止 (prohibition), literally '18 prohibited'. A modern coinage for age restriction labeling.