DopeFish is a kind of ...Huh...symbol, no, a fetiche? dunno! a thingie that appeared in Doom, Quake (and Daikatana) and other games.
Take a look here:
http://www.dopefish.com/
About the Corner Bug, Stella can explain it better than me:
There are many seemingly unreachable places in the various Tomb Raider games. One particularly enticing one is the white stone structure with the large med-pack in the ROOM WITH SQUARE PILLARS AND FIVE SWITCHES. To get there, you can use a technique that players call the "Corner Bug" or "Jump Trick." (Jeff Reid brought this to my attention, but I believe the corner bug was a known quantity before it was applied to this particular spot in the game.)
"From the tall, square pillar to the left of the switch platform, jump over to the middle ledge of the white stone structure. Turn so Lara is facing the white block and the open room is on her right. Sidestep to the right until her right foot is at the edge. Then turn about 45 degrees to the right so Lara is facing the switch platform. Jump straight up and down in place repeatedly and Lara will creep forward toward the corner of the white block. You'll notice her left shoulder and foot start to merge into the block. Then, at a certain critical point, she'll suddenly pop up to the top of the block above, right next to the med-pack. Why? As Lara creeps forward, the game program interprets her position as being INSIDE the block. It knows this can't be true, so it "corrects" by repositioning her on top of the block. This is obviously a bug in the game, but apparently the programmers meant it to be exploited, or they wouldn't have put goodies up there.
If you need more help using the corner bug, check out my useful bugs page (http://tombraiders.net/stella/goodbugs.html) for tips and screenshots. After getting the med-pack, drop back down to the lower block, jump over to the nearest square pillar and from there, jump to the platform with the switches."
It was pretty cool...
😉