For the Sardaukar the rank was comparable to the Old Earth rank of Colonel.
The rank of Bashar is not to be confused with Supreme Bashar, the most powerful military rank used by the League of Nobles during the Butlerian Jihad, as well as the Bene Gesserit during the time of the Honored Matres.
Behind the scenes
Bashar (بشار) is an Arabic proper name meaning "Bringer of glad tidings". It is not known if the rank title is related to the name.