abbreviated character

基本解释

The supplied value may be either the full six character hex string (e. g. FF0000 for red) or the abbreviated three character hex string (e. g. F00 for red).
提供的参数值可能是完整的六位字符的十六进制字符串（例如FF0000表示红色）或者简化的三个字符的十六进制字符串（例如F00表示红色）。
Coded Character Set. A character set in which each character is assigned a numeric code point. Frequently abbreviated as character set, charset, or code set; the acronym CCS is also used.
抽象字符集是现代编码模型的最底层，它是一个集合，通过枚举指明了所属的所有抽象字符。