Around the horns of the altar there was a golden wreath - symbolizing the crown of the priesthood. Four horns protrude from the top of each of the four corners of the altar. On these four horns, blood from the inner sin-offerings was sprinkled, starting with the northeastern horn and ending with the southeastern horn. (Source: Eruvin 19.) 
The Two Golden Stands
Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII