"Very Much appreciate it! (dmesg | grep tty | awk '/cp210x/ {print $NF}' | tail -n1)  is this symbol "|" suppose to represent anything in the command line"

Yes, the "|" symbol is meaningful.  It's called a pipe and it directs output from one command or process to the next item on the command line.

On my keyboard it's shown as two short vertical bars one above the other on the same key as the backslash.