兆
兆通常係指1,0000,0000,0000，即係9999,9999,9999同1,0000,0000,0001之間嘅自然數，用指數記數法就係1×10¹²。
兆除咗用來指「一萬個億」，亦可以指「一百個萬」（106）或者「一億個億」（1016）。
中文
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