1. FAT : Factory Acceptance Testing: Third party products or customized products which needs to be deployed in the client location before integrating with other applications.
Needs to be validated by the business team, based on their confirmation moved to system testing which will be deployed into the client network.
2. VPT: Volume and Performance Testing: Performance Testing is also called as VPT
3. IVT: Implementation Validation Testing
4. SAT: Service Acceptance Testing: Service team ie Support teams (Integration, Application, Colloboration, Database) will validate the deployment procedure.
5. DOT: Deployment Option Testing: Both old and new software versions of the application should work. 
As per the process, deploy the new code and testing will continue once it is done then support team will reverse the new code to old code ie production code.
This code is tested by the testing team.
Note: Similar to IVT but it is not the same

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