heh I like your sense of humor syntax
fishing line is usually made from nylon or other such materials (like dental floss) and are surprisingly strong especially when they are braided. When I used to fish my muskie rod had a 40lb test line on it with a piece of piano wire on the end to prevent a big fish from simply biting through the line. I never caught any muskie larger than 38 inches but they were no match for my rod.
40lb would be the absolute minimum for deep sea though and I think it can go up to a braided 200lb test. I am sure there are stronger lines for large sharks and tuna.
On the low end of freshwater you can get as light as a 1lb test line which is used for trout, panfish, ice fishing or anything else where the fish like to nibble. The lighter the line the more you feel so if a fish is nibbling on your bait you'll know. On the other hand if a fish hits the line like a train *snap*.
My walleye rod had an 8lb test on it and it was twanging when a 28 incher layed into it. This was about 12 or so years ago. That fish took about an hour to get into the boat but boy was it fun. Probably for an all purpose rod 8-12lb would work.
Sorry for the fish stories but that goes with any fishing conversation