Can someone list down what symbol or icon or block diagram used in this diagram (1)

Here is the diagram:

Help appreciated. Thank you. :)

Answer 1

[Arunkumar M]

1. Input port
2. Sum block (with two inputs)
3. Constant block
4. Discrete PID controller (only PI used)
5. Sum block (with three inputs)
6. Subsystem
7. Subsystem
8. Demux
9. Gain block
10. Subsystem (PWM generator)
11. Subsystem
12. Output port

[Affiq]

Thanks a lot!