What does F stands for in PIC12F629?

Answer 1

This was a little difficult to track down on their website:

• their older PICs that stored the program in EEPROM used a "C" in that field of the partnumber
• the new PICs that store the program in FLASH use an "F" in that field of the partnumber

So the "F" in PIC12F629 stands for program code stored in FLASH.
They probably have other letters they will use for other types of program memory that they might use (e.g. masked programmed ROM) but I couldn't find any others than "C" and "F".