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词头是用来构成十进倍数单位的.SI 词头原有16个,包括的因数范围为10~(-18)(a)～10~(18)(E).鉴于科学技术的飞速发展,原有词头已显得不够用了,因此国际单位制组织建议新增加如下表所列的4个词头.
The prefix is used to form decimal multiples. The original 16 prefixes for the SI prefixes range from 10 (-18) (a) to 10 (18) (E). In view of the rapid development of science and technology, There is not enough headline available, so the International System of Units recommends the addition of four new headings as shown in the table below.