In computer science, terminal and nonterminal symbols are those symbols that're used to construct production rules in a formal grammar. Terminal symbols Terminal symbols are literal strings forming the input of a formal grammar and can't be broken down into smaller units without losing their literal meaning. Nonterminal symbols Nonterminal symbols are the productions rules within the formal grammar consisting of a sequence of terminal symbols or nonterminal symbols. Nonterminal symbols may s… (More on Nonterminal)