In Unix, what do some obscurely named commands stand for?

A list of some of the more obscurely named Unix commands follows from the Indiana University UITS Knowledbase:

• awk - Aho, Weinberger, Kernighan - how do I use awk?
• grep - Global regular expression point - how do I use grep?
• fgrep - Fixed grep
• egrep - Extended grep
• cat - Catenate - In Unix, how do I combine several files into a single file?
• nroff - New roff
• troff - Typsetter new roff
• tee - T
• biff - A dog named Biff
• rc - runcom
• Perl - Practical extraction and reporting language - more info

Click on the link to for basic definitions of the acronyms/terms listed above.