What is this icon?

[Steve L3]

Can anyone tell me what this icon is? It has popped up a few times but I don't know what it is. When I pull down the top bar there is nothing referencing it.

 

[sarim_xyz]

re:

This means your phone is on Vibrate only. If you turn up the ringer volume, it will go away.

 

[xandros9]

That's bacon mode.