Matrix UI is a tiled user interface was introduced in TS-UGOS SO. It's one of the four main TSUG user interfaces, the other was XUI. It is enabled by default since TS-UGOS TT.
The default apps for the interface are Star Web/Red Star, TheoryShop, TheoryOffice, TheoryMedia, TheoryMail, Theorysonic One, games center, file manager, etc. It can edit or arranges apps on this interface. It can expand from 3X3 to 9x9 or shrink to 2X2.
9-tiled/3X3 Matrix UI in TS-UGOS SO and TEN. (no apps)
9-tiled/3X3 Matrix UI in TS-UGOS EV. (no apps)
9-tiled/3X3 Matrix UI in TS-UGOS FT. (with apps)