Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Delta Ophiuchi is a star in the constellation Ophiuchus. It has the traditional name Yed Prior. The traditional name Yed is derived from Arabic meaning "the hand", and the two stars are the left hand of Ophiuchus that holds the head of the serpent Serpens Caput. According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Yam n or Nasak Yamani were the title for two stars : Ser as Nasak Yamani I and Ser as Nasak Yamani II.