Question about test chamber symbols...
I know I'm probably going to be labeled a newbie for this, but what is the second-to-last symbol on the numbered test chamber signs? There's cube-dropper, person hit by cube, person hit by high energy pellet, high energy pellet entering catcher, person being killed by goo, person jumping into a portal, person using a basic fling, a person being shot by a turret, and then something else - a person leaning over something which almost reminds me of a water fountain - and then finally cake.
So what is the second-to-last symbol? I think it has something to do with moving platforms, or something like that, but honestly, it's driving me crazy, and I'd love it if someone could explain what it is.
Thanks a ton, and excuse the lack of thinking with portals... or symbols. 
I think it was intended for a type of puzzle that never got implemented as it is never lit on any test chamber signs (that I can think of off the top of my head) .
It's lit in chambers 14, 15, 18, 19, and at least one other, the one where toxic goo is first introduced.
I always interpreted it as "Don't drink the water".
I assumed it meant something like don't drink the water.
Ah, never mind me then. Haven't played the single player in quite a while.
You mean this:
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What he said.
More of Valves dark humour.
[quote="Leck"]I assumed it meant something like don't drink the water.[/quote]
Well, that makes sense, since, as I said, it shows up on chambers 14, 15, 18, 19, and the first chamber with goo, so "Don't drink the water" is probably a valid interpretation, unless someone has a better idea.