The American linguist Joseph Greenberg (1915–2001) proposed a set of linguistic universals based primarily on a set of 30 languages. The following list is verbatim from the list printed in the appendix of Greenberg's Universals of Language[1] and "Universals Restated",[2][3] sorted by context.
The numbering is fixed to keep Greenberg's number associations as these are commonly referenced by number; e.g.: "Greenberg's linguistic universal number 12".