Hedonium is the arrangement of the universe's resources optimized for the production of pleasurable experience (Bostrom 2014: 140).

The term was introduced by Carl Shulman in a seminal 2012 essay (Shulman 2012). Sometimes 'utilitronium' is used to express this same concept, though that term may instead be understood more broadly as referring to whichever state is regarded as the ultimate bearer of value, such as preference satisfaction on preference utilitarianism.