Batō Kannon is invoked during the Jūhachidō 十八道 practice when closing the vajra net to seal the sacred space. He is distinguished by the white horse's head that he wears like a crown.
The horse is one of the symbols of dominion of the "Ideal King" (Kyōryōrinjin 教令輪身 or Kyōryōjō-ō 教令聖王), known as Chakravartin in Sanskrit.
Nowadays you even find bicycles in front of the many stone votive statues to Batō on waysides.
There is also a version with the head of an ox (Gotō Kannon 牛頭観音) or a pig (Tontō Kannon 豚頭観音).
There is also a special mudra for the horse-headed deity called the Batō Myō-in, Bakō-in (or makō-in) -- as quoted from Ashida and Hanayama.” Gigantic effigies of Kannon are known as Dai-Kannon 大観音.
Batō is sometimes found in sets of the Six Kannon, but independent images dating from the Heian period (794-1185) are rare.
Well-known examples dating from the Kamakura and Muromachi periods include the standing statues in Kanzeonji Temple 観世音寺 in Fukuoka prefecture and Jōruriji (Joruriji) Temple 浄瑠璃寺 in Kyoto, as well as the painted image of seated Batō in the Boston Museum of Art.