This is the 12641st most frequent Polish word.
net
"Net" in Polish means "net" or "network."
Here, 'siatkę' refers to a net used for fishing.
Mam nową siatkę na ryby.
I have a new fishing net.
In this context, 'internet' is referred to as the net in an informal and colloquial sense.
Mój komputer jest podłączony do internetu.
My computer is connected to the internet.
'Siatce' here refers to the volleyball net used in games.