字母数字符号 meaning in English

alphameric character
alphameric code
alphanumeric character
alphanumeric symbol

Inscriptions in aircraft . letters , numbers , signs and accents
飞机用标志.字母数字符号文字
A string sort is similar to a word sort , except that there are no special cases and all nonalphanumeric symbols come before all alphanumeric unicode characters
字符串排序与单词排序相似，唯一区别是字符串排序中不存在特殊情况，所有非字母数字符号均排在所有字母数字unicode字符之前。