String grammar is a term used to refer to the set of rules that dictate how a sequence of symbols or words can be combined to form a sentence or statement. There are several synonyms for the term string grammar, including syntax, grammar rules, sentence structure, and language rules. These terms are all used in linguistics to describe the set of rules that govern how language is used and help ensure that sentences are coherent and meaningful. Understanding these rules is essential for effective communication, both in written and spoken form, and is an important area of study in any language.