Uji no shaku refers to conferring a rank of Jugoi (Junior Fifth Rank) on one person each annually from among persons ranked Shorokuinojo (Senior Sixth Rank, Upper Grade) in the O clan, Minamoto clan, Taira clan, Fujiwara clan, Tachibana clan and others when the investiture was conducted on January 6 (old calendar) of every year from the Heian period.
氏爵（うじのしゃく）とは、平安時代より、毎年正月6日に行われる叙位に際し、王氏、源氏、平氏、藤原氏、橘氏などの正六位上の者より、毎年1人ずつ従五位に叙すことをいう。