can anyone help me with these blocks in simulink and tell me what they are

Hi Iwant to simulate an article and here I have a question in the ''Engine nonlinear model" there are three block. one of them is rate transition can you help me with two others

Thank you very much

Answer 1

[Walter Roberson]

polynomial of degree 2 https://www.mathworks.com/help/simulink/slref/polynomial.html

Rate transition

The third is a subsystem. You would need to open it to see the blocks.