What is the speed (RPM or percent) of the high pressure compressor in a dual compressor engine referred to as?

The speed of the high-pressure compressor in a dual compressor engine is referred to as N2. This designation is part of a standard naming convention used in aviation to differentiate between the speeds of different components within the engine. In a dual spool engine, there are typically two main components that rotate at different speeds: the low-pressure compressor and the high-pressure compressor. N1 represents the speed of the low-pressure spool, while N2 specifically indicates the high-pressure compressor's speed. This differentiation is critical for monitoring and managing engine performance, efficiency, and operational safety during various phases of flight. Understanding the significance of N2 aids flight engineers in troubleshooting engine issues and ensuring optimal operation.