Symbols are used in An Inspector Calls to represent ideas and values beyond their literal meanings. Some symbols in the play include a port and whisky, an engagement ring, the Inspector, the Titanic, a door bell, disinfectant, and a telephone. Priestley develops characters not only through what they say, but also how they speak, with each character distinguished by catchphrases, phrases, vocabulary, slang, and content of speech that make their voices unique.