İn lithics, severe short angles coming to a sharp point. used as a prefix to a date, it indicates years after the birth of Christ or the beginning of the Christian calendar. Anno Domini (Latin) means “In the year of our Lord.” The lower case “ad” represents uncalibrated radiocarbon years and ad denotes a calibrated radiocarbon date or a historic date that does not need calibration. There is no year 0; 1 bc is followed by ad 1.
Dictionary of Artifacts, Barbara Ann Kipfer, 2007Copied