Quotation Mark

Quotation Mark is a binary character property that identifies characters used to enclose direct speech, quotations, or cited text, such as the straight apostrophe, double and single quotes, curved curly quotes, guillemets, and various language-specific marks like the low or reversed forms. Characters with this status are typically paired, though some may serve as both opening and closing, and their usage can vary by context, such as in typographic or programming languages. This classification aids in text processing, including parsing quoted strings, smart quote conversion, and syntactic analysis, by distinguishing these punctuation marks from other symbols like primes or apostrophes used for contractions. The property does not dictate pairing rules or directional behavior, which are left to higher-level algorithms, but serves as a foundational flag for recognizing quote-like characters across scripts and writing systems.