14 character limit on filenames (UNIX)

[Lab Manager <lab%rochester.arpa@CSNET-RELAY>]

As I recall, there was some alternate system-type (other than UNIX)
to be put in the namespace, so when you do a copy-file or whatever to a UNIX
host, it didn't limit it to 14 characters. I've tried UNIX-42 and UNIX42 to
no avail, and couldn't find it in the documentation. Is this just
my imagination that such a thing already exists?

Thanks for your help,
Brad Miller	 ARPA:	lab@rochester.arpa	UUCP:rochester!lab
			(also miller@rochester for grad student stuff)
			Title:	CS Lab Manager
			 Snail:	University of Rochester Computer Science Department
			617 Hylan Building	Rochster, NY 14627