商标中，常看到R与TM，之间异同是什么？

美国专利商标局对TM 和SM 与 ®区别的标准答案
(现在"知道"中看到很多关于TM 和 ® 的区别的表述是错误的,TM是美国的东西看看他们的答案,如果你有兴趣可以在USPTO(美国专利商标局)的官方网站查询相关内容http://www.uspto.gov/smallbusiness/trademarks/faq.html)

What is the difference between the notations TM or SM and the ®?
Any time you claim rights in a mark, you may use the "TM" (trademark) or "SM" (service mark) designation to alert the public to your claim, regardless of whether you have filed an application with the USPTO. However, you may use the federal registration symbol "®" only after the USPTO actually registers a mark, and not while an application is pending. Also, you may use the registration symbol with the mark only on or in connection with the goods and/or services listed in the federal trademark registration.

恕不提供可能不标准的翻译
个人观点如下:
® 是世界大多数国家认可的注册标记,