Infocom's Development Tools

The folks at Infocom seemed to like their acronyms. There’s ZIL, ZIP, ZAP, ZILCH… I know what these stand for except ZILCH. Does anyone know?

I can speculate that it’s the Zork Implementation Language Compiler “Something.”

There is a sort of explanation here but It doesn’t elaborate on what the initials / word stands for if anything.

I’ve never seen ZILCH explained any other way than “ZIL Compiler”. Perhaps they stuck the H on to make ZIL+C into a word.