Graded Surveillance Measure is the term used for GSM. The securities and Exchange Board of India (SEBI) and Exchanges have been introducing enhanced surveillance measures to enhance market integrity and protect investors' interests. These measures include reducing the price band, holding periodic call auctions, and transferring securities from time to time to the Trade to Trade segment.

For more information, click on the given link:-

https://www.nseindia.com/regulations/graded-surveillance-measure