A waa (Thai วา) is an all but obsolete unit of length, equal to 2 metres (2 m). Its current size is precisely derived from the metre, but is neither part of nor recognized by the modern metric system, the International System (SI).The metre and derived units like kilometre are common in Thailand, but the waa still occurs often as dtaaraangwaa, which means 'square waa', a unit of area.As for many terms normally written in Thai alphabet, transliteration into English language caused a spelling variant, wah.
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