The cardinal number, represented by the symbol, designating the first such unit in a series.
基数，用符号表示，代表一系列中这样的单元中的第一个。
2
This article refers to quanltity and unit, term and symbol, numeral and quanltity, and the mathematic operation relating to them. Aspects needing attentions in use are discussed.
本文就量与单位，名称与符号，数值和量的运算以及运用中应注意的问题进行了扼要介绍。
3
Glass curtain wall unit as an important symbol of modern architecture, has been widely used.