What's the more accepted notation used to label sensors present in turbo-jet engines?

Question

I'm interested in learning what the proper (more accepted) notation used to label sensors present in turbo-jet engines is.

Came across a few examples such the ones shown below but would like to learn if there is a 'standardized' methodology.

Temperature and pressure notation

Speed Notation

Answer 1

Sensors are identified in your picture by either P or T, for pressure or temperature, and the engineering station number.

Station numbering is standardized in SAE ARP 755: SAE Aerospace Recommended Practice 755 - Turbine Engine Performance Station Numbering. As you find yourself this standard has been extended to SAE AS 755 - Aircraft Propulsion System Performance Station Designation to take into account more complex engines

The main stations for a turbojet are:

Additional stations are used, e.g. for a turbofan. :

Source.

These numbers are used, for example, in this temperature-entropy diagram:

Source.

You can see the raise of temperature by the combustor between {3} and {4}. See this answer for explanations.