Earlier only goods were trademarked. However, with the introduction of classes 35 – 45 which pertains to service category, a different type of trademark symbol “SM” is used to denote the trademark for services. Its usage as such is out of the convention and there is no specific law on this. It is a common practice to use ™ symbol for trademark applications filed under class 1-34 and for trademark filed under class 35-45, SM symbol is commonly used and preferred by the applicants. However, using the TM symbol for all classes is also acceptable.