The T-stack is a basic stack that is formed when half your cutters think you're doing a horizontal stack and the other half think you're doing a vertical stack.
This causes a lot of confusion and lane clogging. Cut it out. Talk to your team mates before you play the point and settle on what play or stack you want to do.
A variation of the T-stack is the L-stack. This usually happens when one cutter gets confused. Don't do this.
Here's another variation of the T-stack....please don't do this.
The point of this stack is: don't do it unless if you know what you're entire team is actually doing (aka, you have a designated set play based off a T-stack).
I swear to god, if we do this on Wednesday, I'm going to throw the disc away on purpose...