usage need not have sufficient . For example, ("spicy, salty") is an adjective requiring the suffix , but may also be spelt as, for example, (both legitimate of the characters) on a poster, for example, where there is no intention of inflecting this spelling. Single-character loan words Most are multi-character, but in rare cases they can be single-character, as in (simplification of , for which is the Chinese-derived pronunciation), used for "can, metal tin" ( originally meaning "metal pot, iron teakettle"). This is classified as . In some rare cases, an individual kanji has a loan word reading – that is, a character is given a new reading by borrowing a foreign word – though most often these words are written in . The three most notable examples are , , and . (from the Portuguese , "button") and are marginally understood or used in some settings, but most are obscure – see list of single character loan words for more. These are classed as of a single character, because the character is being used for meaning only (without the Chinese pronunciation), rather than as , which is the classification used when a loanword term is using existing sounds only (as in "tempura"), or alternatively as a compound with meaning only (as in – the sound cannot be broken down into readings of individual characters). In principle these could be considered as 1-character meaning-only , but because the reading corresponds to a single character, these are considered readings instead. Note that while are generally written as when writing out the word in instead of kanji (because native Japanese), these are generally written as (because a foreign borrowing). See single character gairaigo for further discussion. Note that numerically, most of these characters are for units, particularly SI units, in many cases using new characters () coined during the Meiji period, such as from "meter" + "thousand"; this character is obscure and not in common use. Some non-kanji symbols or Latin character abbreviations also have loanword readings, often quite long; a common example is '%' (the percent sign), which has the five kana reading (), while the word "centimeter" is generally written as (with two half-width characters, so occupying one space) and has the seven kana reading () it can also be written as , as with kilometer above, though this is very rare). Many borrowed measurement terms may be written as