word will have many such kanji spellings. An extreme example is , which may be spelt in a great many ways, including , , , , , , , ,, , and —many of these variant spellings are particular to haiku poems. Single character gairaigo In some rare cases, an individual kanji has a reading that is borrowed from a modern foreign language (gairaigo), though most often these words are written in katakana. Notable examples include , , , and . See list of single character gairaigo for more. These are classed as kun'yomi of a single character, because the character is being used for meaning only (without the Chinese pronunciation), rather than as ateji, which is the classification used when a gairaigo term is written as a compound (2 or more characters). However, unlike the vast majority of other kun'yomi, these readings are not native Japanese, but rather borrowed, so the "kun'yomi" label can be misleading. The readings are also written in katakana, unlike the usual hiragana for native kun'yomi. Note that most of these characters are for units, particularly SI units, in many cases using new characters (kokuji) coined during the Meiji period, such as . Nanori Some kanji also have lesser-known readings called , which are mostly used for names (often given names) and, in general, are closely related to the kun'yomi. Place names sometimes also use nanori or, occasionally, unique readings not found elsewhere. When to use which reading Although there are general rules for when to use on'yomi and when to use kun'yomi, the language is littered with exceptions, and it is not always possible for even a native speaker to know how to read a character without prior knowledge (this is especially true for names, both of people and places); further, a given character may have multiple kun'yomi or on'yomi. When reading Japanese, one primarily recognizes words (multiple characters and okurigana) and their readings, rather than individual characters, and only guess readings of characters when trying to "sound out" an unrecognized word. Homographs exist, however, which can sometimes be deduced from context, and sometimes cannot, requiring a glossary. For example, may be read either as kyō "today (informal)" (special fused reading for native word) or as konnichi "these days (formal)" (on'yomi); in formal writing this will generally be read as konnichi. In some cases multiple readings are common, as in "pork soup", which is