Printing, the grapheme is an atomic unit of written language. Graphemes include letters, Chinese characters, Japanese characters, digits, punctuation marks, and other glyphs. Phonological orthography, a grapheme corresponds to one phoneme. The spelling systems, which are not phonemic — for example, the most widely used writing in English — some graphemes may represent one phoneme. They are called digraphs (two graphemes one phoneme) and trigraphs (three graphemes). For example, the word ship contains four graphemes (s, h, i and p) but the only three phonemes, because sh is a digraph. Different glyphs can represent the same grapheme, meaning they are allographs. For example, you are in the message can be seen in two versions, with a hook at the top, and without. Not all glyphs are graphemes phonological sense, such as the ampersand logograma (&) is the Latin word et (English word) in which there are two phonemes.