implies that a sentence, term, expression or word cannot symbolically represent a single true meaning; such meaning is underspecified (which cat sat on which mat?) and potentially ambiguous. By contrast, the meaning of an utterance can be inferred through knowledge of both its linguistic and non-linguistic contexts (which may or may not be sufficient to resolve ambiguity). In mathematics, with Berry's paradox, there arises a similar systematic ambiguity with the word "definable". Referential uses of language The referential uses of language are how signs are used to refer to certain items. A sign is the link or relationship between a signified and the signifier as defined by de Saussure and []. The signified is some entity or concept in the world. The signifier represents the signified. An example would be: Signified: the concept catSignifier: the word "cat" The relationship between the two gives the sign meaning. The relationship can be explained further by considering what we mean by "meaning." In pragmatics, there are two different types of meaning to consider: semantic-referential meaning and indexical meaning. Semantic-referential meaning refers to the aspect of meaning, which describes events in the world that are independent of the circumstance they are uttered in. An example would be propositions such as: "Santa Claus eats cookies." In this case, the proposition is describing that Santa Claus eats cookies. The meaning of the proposition does not rely on whether or not Santa Claus is eating cookies at the time of its utterance. Santa Claus could be eating cookies at any time and the meaning of the proposition would remain the same. The meaning is simply describing something that is the case in the world. In contrast, the proposition, "Santa Claus is eating a cookie right now," describes events that are happening at the time the proposition is uttered. Semantic-referential meaning is also present in meta-semantical statements such as: Tiger: carnivorous, a mammal If someone were to say that a tiger is a carnivorous animal in one context and a mammal in another, the definition of tiger would still be the same. The meaning of the sign tiger is describing some animal in the world, which does not change in either circumstance. Indexical meaning, on the other hand, is dependent on the context of the utterance and has rules of use. By rules of use, it is meant that indexicals can tell you when they are used, but