Ligatures refer to typographic elements that join two or more letters into a single glyph. A synonym for ligatures is "letter combinations," which is similar in meaning and usage. Another synonym for ligatures is "ligman," which is an obsolete term for a ligature or abbreviation symbol. Other synonyms for ligatures include "tie," "binding," "fastening," and "connecting." These words all carry a similar sense of bringing two things together, whether it's two letters, two words, or two concepts. Regardless of the synonym used, it's clear that ligatures play an important role in typography and are essential to creating clean, professional-looking text.