Graphemes are the smallest units of written language that establish the fundamental building blocks of written communication. They come in different sizes, shapes, and sounds, and serve as the basic units of a writing system. Depending on the context, graphemes can be referred to using various synonyms. Some popular synonyms for graphemes include letters, characters, symbols, signs, scripts, graphons, glyphs, and marks. Letters are the most commonly used synonym for graphemes, as they are the most basic elements of written language recognized by everyone. Other synonyms like symbols, signs, scripts, and graphons refer to various types of written representations that can convey meaning and facilitate communication. Regardless of the synonym used, graphemes are essential components of any writing system and form the basis of all linguistic expression.