What is the meaning of LSX

[bigtyme1]

so I was thinking about adding LS1 to my cowl hood as I paint in a few weeks. Pete offered to help me out with the letters today. Then I thought, Really it was Jay R, my car is really outdated considering most people are using LS2 to LS9. SO jason thought Maybe LSX. is LSX just the iron block motor or is it the name of all the LS motors? Just don't want to lie about what's under the hood.