What is this Simulink block called?

What is this middle block in Simulink? I cannot find it in the library.

Answer 1

[Ir. Ts. Dr. Kah Yung Yap, CEng (UK)]

Hi, David Baas. This block in the middle is called as "Subsystem". It is a group of blocks that have been simplified into a subsystem. For more details, you may check out: https://www.mathworks.com/help/simulink/ug/creating-subsystems.html

Thank you.