  Terminological Note: As Chomsky acknowledges (e.g., 1986:28-29),  ‘Universal Grammar’ is used with a systematic ambiguity  in his writings. Sometimes, the term refers to the inborn knowledge  of language that learners are hypothesized to possess — the  content of the ‘initial state’ of the language faculty  — whatever that knowledge (/content) turns out to be.  Other times, ‘Universal Grammar’ is used to refer to  certain specific proposals as to the content of our innate  linguistic knowledge, such as the Government-Binding theorist's claim that we have inborn knowledge of such things as the Principle of  Structure Dependence, Binding theory, Theta theory, the Empty  Category Principle, etc.