It's become so iconic that attempts to change its taste in 1985—sweetening it in a move projected to boost sales—proved disastrous, with widespread anger from consumers.
2017年12月六级真题（第一套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
偶像的;圣像的;似圣像的
An iconic image or thing is important or impressive because it seems to be a symbol of something.