看英文文章时，经常看到有在非商标的普通单词、词组右上角加上 TM 标记，这是有什么梗吗？
比如 https://yarnpkg.com/blog/2016/11/24/lockfiles-for-all/ 中的一段：
For applications, most developers agree that lockfiles are A Good Idea™. But there has been some question about using them when building libraries.
这里的 A Good Idea 不是商标吧，加上 TM 是为了强调什么？
比如 https://yarnpkg.com/blog/2016/11/24/lockfiles-for-all/ 中的一段：
For applications, most developers agree that lockfiles are A Good Idea™. But there has been some question about using them when building libraries.
这里的 A Good Idea 不是商标吧，加上 TM 是为了强调什么？
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