You may notice a brand name with a small superscript ™ or ®.
This article explains the difference between a ™ and ® symbol.
The ™ sign is used when a trademark registration file is under process for that brand name; there is no such prohibition in India if you start using a ™ sign with your brand name before filing a registration application.
The procedure to register a trademark can take up to 2 years after you file the registration application.
Once registered, you can start using ® symbol with your brand name.