In text-to-speech synthesis, a non-standard word is a sequence of characters between a pair of word boundaries that is not found nor is easily derived from words in a standard dictionary of the language. Examples of non-standard words are: - cardinal numbers: 123 (one hundred and twenty-three) - ordinal numbers: 13th (thirteen) - roman numbers: Charles ||| (Charles third) - money amounts: 20.10€ (twenty euros and ten cents) - percentage: 3.5% (three point five per cent) - dates: 1755/11/1 (first of November of seventeen fifty-five) - years: the 90's (the nineties) - time: 12:10 (twelve ten) - symbols: + (plus) - abbreviations: Av. (avenue) - acronyms: NY (New York), GPU (gee pee u) Many non-standard words can have multiple meanings corresponding to different conversions to standard words. This meaning is called the [[semiotic class]] of the word.