Do you know which Simulink block this is?

I can't find this block in the Simulink Library Browser and I don't know the name. I have seen it in various papers. Does any one recognize it?

Thanks,

Answer 1

[Danilo NASCIMENTO]

This is the memory block you can find it in the discrete library. This block applies a one integration step delay. The output is the previous input value.

[ASU]

Thanks!