I don't know what the T stands for, sorry.
My thread all fits on one wooden thread rack. I have just a few poly spools and put them all on the left side, farthest from my machine. Machine quilting thread is all I have otherwise, as I don't have any specialty machines. I use those rubber "Peels" around each bobbin that has thread on it, and I use matching "huggers" for the spools. I stack the spool on top of the bobbin if the thread colors match.
My discipline is to not buy thread unless I have room for it on that ONE rack.