The average English word has only five letters; the average Inuit word, for example, has fourteen. English has relatively few characters; Ethiopian has three hundred and forty-five symbols, which do not fit on most keypads. English rarely uses diacritical marks, and it is not heavily inflected. Languages with diacritical marks, such as Czech, almost always drop them in text messages. Portuguese texters often substitute “m” for the tilde. Some Chinese texters use Pinyin—that is, the practice of writing Chinese words using the Roman alphabet.