What is pahana?

Some articles on pahana:

Hopi Mythology - Four Worlds - Sacred Hopi Tablets
... be in the possession of the Fire Clan, and is related to the return of the Pahana ... an elder of the Fire Clan worried that his people would not recognize the Pahana when he returned from the east ... This section was given to Pahana and he was told to bring it back with him so that the Hopi would not be deceived by a witch or sorcerer ...
Hopi Mythology - Pahana
... The true Pahana (or Bahana) is the Lost White Brother of the Hopi ... Most versions have it that the Pahana or Elder Brother left for the east at the time that the Hopi entered the Fourth World and began their migrations ... Traditionally, Hopis are buried facing eastward in expectation of the Pahana who will come from that direction ...