'During the United States v. Microsoft Corp. trial, evidence was presented that Microsoft had tried to use the Web Services Interoperability organization (WS-I) as a means to stifle competition, including e-mails in which top executives including Bill Gates and Steve Ballmer referred to the WS-I using the codename "foo".[13]'
https://en.wikipedia.org/wiki/List_of_military_slang_terms#F...
Not to be confused with "Foobar" which apparently originated at MIT: https://en.wikipedia.org/wiki/Foobar
TIL, an interesting footnote about "foo" there:
'During the United States v. Microsoft Corp. trial, evidence was presented that Microsoft had tried to use the Web Services Interoperability organization (WS-I) as a means to stifle competition, including e-mails in which top executives including Bill Gates and Steve Ballmer referred to the WS-I using the codename "foo".[13]'