What is an Indian head coin?

There are several US Coins featuring an American Indian on the obverse ("heads"). They include the Buffalo Nickel (features a buffalo on the reverse), the Indian Head Penny (has a wreath and "one cent" on reverse), the Sacajawea one dollar coin (first minted in 2000) and many gold coins (they are historic coins, all are dated before the 1940s and made out of 90% pure gold) including the half-eagle, three-dollar piece, quarter-eagle, gold dollar, and eagle gold coins. Without knowing which "Indian head" coin you are referring to, let alone the date, mint-mark and condition it is impossible to say what it is worth.