Physics Coordinate Systems

noun a word used to identify any of a class of people, places, or things

verb a word used to describe an action, state, or occurrence

adjective a word that describes or modifies a noun or pronoun

adverb a word that modifies or qualifies an adjective, verb, or other adverb

pronoun a word that can function by itself as a noun phrase and that refers either to the participants in the discourse or to someone or something mentioned elsewhere in the discourse

preposition a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause

conjunction a word used to connect clauses or sentences or to coordinate words in the same clause

interjection a word or phrase that expresses a strong emotion

• X marks the spot where the treasure is buried.
• Hey, can you show me where X is on the map?
• I heard there's some good stuff hidden at X.
• In this equation, X represents the unknown variable.