What does the run symbol above the fly button mean?

I like to live in the trees. Yes, I said trees. That sounds like a crazy idea, right? Well, I'm gonna give you a guide to do this. I dig in the ground, then pick up the freshly dug-up dirt. I will then use the dirt tiles to kinda make stairs up to a tree, while I sit at the top of these make-shift stairs I dig a hole in the tree. You can dig more holes to put a workbench in your tree house, and even a bed!

Hey, I have an idea for the creator of a server, why not make it so they can bring up a panel that will have certain options on it, and it could be IP based, these options could include: 

Muting/Banning a player from their server.

Kicking a player off their server with a warning message.

Sending a player an on screen message.

Giving players certain rights to the server such as kicking (no banning) and muting for set periods of time.

Giving/Revoking building rights.

Maybe even add mob spawning and allow them to enable survival features :P

Now got Planet of Cubes, World of Cubes, and my forums notifications set to come to my phone, I LOVE WOC! 

Okay, so this is a question that's been bugging me for ages, are you going to introduce multi player survival into the game? Because you could do pay to play on certain game modes, like zombie survival or world war modes etc. Because I'd pay for stuff like that, it gets lonely with just your sword and a pocket full of diamond ore :(

I hate all bugs, creepy crawlies and game ones, I want to blast all bugs out from WoC but I need help :o my knowledge of WoC isn't the best, I only been playing for a month or so, so I could really use some people that know a lot about the game and how it all works :) 

Current bugs I'm trying to figure out;

•Blue screen when a GUI is up (No idea why this happens)

•Doors splitting in two on multiplayer (Due to 2 people opening and closing)

•bugged monsters (spawning in wrong places/not dying)

•Invisible cube bug (an incredibly rare bug)

So now that I went over fishing mechanics,now i'll go over aquatic animals!

Okay, so A. Is swear filter still in the game? If it is it be off. And B. Why do you even need a swear filter? There's an option to lock chat so lil kids can't see adult talk :3 

More stuf so i can blow eveything i made up

Nukes are such cool much wow