这个应修钱力钢法济然源持早茶该是 Unicode 中的特殊字符 U+FFFD，对应 约含殖算眼盐价往衣货绝UTF-8 编码是 0xEF 0xBF 0xBD，这个字符的名字叫 replacement character欢怕征管，维基百科对它的解释是来自:

The replacement charac360问答ter (often a black diamond with a white question mark or an e按占语迅套系临获它协mpty square box) is a symbol found in the Unicode standard at code p案班章防证阿机空之oint U+FFFD in the 检吗握Specials table. It is used to indicate problems when a system is unable to render a stream of data to a correct symbol.