letter character meaning in English

字母符号
字母字符

The unicode definition of letters includes latin characters from a through z , from a through z , and also letter characters from other languages
Unicode中定义的字母包括拉丁字符a - z和a - z ，以及来自其他语言的字母字符。
Acceptable letters are those defined by the unicode standard 2 . 0 , including latin characters a - z , a - z , and letter characters from other languages
可接受的字母为unicode标准2 . 0中定义的字符，包括拉丁字符a - z和a - z ，以及源于其他语言的字母字符。
Specifies whether the comparison distinguishes between letter characters and symbols such as white - space characters , punctuation , currency symbols , and mathematical symbols
指定比较是否区分字母字符和符号（如空格字符、标点、货币符号和数学符号）。
Experimental results show that the proposed method in this paper has better recognizing effect when dealing with depigmentizing , dirt , split , blurry and uniform - illuminated number and letter characters
实验结果表明，该方法对车牌字符褪色、污迹、断裂、模糊、光照不均等质量退化车牌图像具有较好的识别效果。