Arrowhead

 is an item found in Red Dead Revolver.

Description
"Genuine arrowhead used in battle by the Black Elk Tribe, one of two native tribes in this territory."

- Store description

As with all similar items, the is not used in the game beyond unlocking a showdown character and journal page.

The store description references the Black Elk Tribe, of which Standing Snake was a member. The other tribe noted in the description is the Red Wolf Tribe.

Unlocks

 * Standing Snake as a multiplayer character in Showdown Mode.
 * Pages 134 - 135 of Sheriff Bartlett's Journal, covering Standing Snake.

Merchants
The can be purchased from the Shop interface at the start of the mission "End of the Line". If not purchased, it is not available subsequently during the current game.

Standing Snake can also be unlocked by earning an Excellent rating on the mission "Bear Mountain". If unlocked in this way, the will show as sold in the Shop interface.