What is the shamrokh modification in endodontics in one text please help mee ?

Canals: It's an Endodontic technique that facilitates gutta percha manipulation to fill lateral canals.

Modification: When we access a tooth for root canal therapy we need to see directly down onto the nerve space. We use a specific shape of access for each tooth at times this needs to be modified to allow the direct/straight line access. Nothing to worry about just a different/modified shape to the access.