In light of the feast of St Joseph today I found this explanation of the new papal coat of arms very beautiful. From the Vatican Information Service:
The shield has a bright blue background, at the centre top of which is a yellow radiant sun with the IHS christogram on it representing Jesus (it is also the Jesuit logo). The IHS monogram, as well as a cross that pierces the H, are in red with three black nails directly under them. Under that, to the left, is a star representing Mary, Mother of Christ and the Church. To the right of the star is a nard flower representing Joseph, Patron of the Universal Church. With these symbols the Pope demonstrates his love for the Holy Family.
St Joseph, just man, faithful spouse of the Virgin, and earthly father of Jesus, pray for us!