"Bigpond" is simply the name of the wireless network setup by the user.
I make it difficult or basically impossible for unknown users to access my wireless network.
1. I use a complex password that's over 16 characters long and has some symbols and numbers. Easy for me to remember.
2. Additionally, I setup my router to only allow devices with specific MAC addresses to be able to access the wireless network. Every wireless device be it a phone, laptop, PC, gaming console has a unique MAC address and can be added to an access list.
Non-tech savvy people probably only use a password; #1 from above.
Most tech savvy people and others who are more concerned about security perform #1 & #2.