What doe's ACME stand for?

Definition for ACME is:

1 - the highest level or degree attainable; the highest stage of development; "at the height of her career"; "the peak of perfection"; "summer was at its peak"; "at the top of his profession"

2- the highest point (of something); "at the peak of the pyramid"

The definitions of ACME are why companies have chosen to use ACME in their names.