/dev/ttyb missing from UBUNTU

HI All
I am doing first steps in debugging with GDB.
I have been suggested to redirect output to another terminal using the command using

tty /dev/ttyb

I had a look at my ubuntu doing

 ls /dev/tty*

and I cannot find this

ttyb

.

What is it and how to achieve the same thing?

I am totally newbie so right now I doing some reading to understand how terminal works and what this command does. Do you have any suggestion or tip to follow that might help my research / improve my learning?

Regards
Mnstn