FASTI, or Dies Fasti, likewise denoted court days. The word fasti, fastorum, is formed from the verb fari, to speak, because during those days the courts were opened, causes might be heard, and the prætor was allowed fari, to pronounce the three words, do, dico, addico. The days in which this was prohibited were called nefasti.
The dies fasti were noted in the kalendar by the letter F; but it is to be observed that there were some days ex parte fasti, partly fasti, partly nefasti, in which justice might be distributed at certain times of the day, and not at others. These days were called intercisi, and were marked in the kalendar by the letters F. P. fastos primo, in which justice might be demanded during the first part of that day.