Hidatsa

The following account is from information given by several persons of the Mandan, Hidatsa and Arikara tribes.
Prairie Smoke (Second Edition, Revised)|Melvin Randolph Gilmore
Their language differs only slightly from that of the Hidatsa.
Villages of the Algonquian, Siouan, and Caddoan Tribes West of the Mississippi|David Ives Bushnell
The same is true of the Hidatsa pitika, which signifies a smoothing out, or straightening.
The Number Concept|Levi Leonard Conant
(Mandan and Hidatsa I.) "To kill with a blow; to deal the death blow."
Sign Language Among North American Indians Compared With That Among Other Peoples And Deaf-Mutes|Garrick Mallery

American instructed deaf-mutes use substantially the sign described by (Mandan and Hidatsa I).
Sign Language Among North American Indians Compared With That Among Other Peoples And Deaf-Mutes|Garrick Mallery