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Natuke täpsemalt mis oli ja ka on "nikkel" ehk "nickel" ehk "nicks". Nickel (United States coin) - Wikipedia

Tsitaat:The term was originally applied to the 1857–1858 Flying Eagle cent and the Indian Head cent coin from 1859 to 1864, which were composed of copper-nickel. Throughout the Civil War these cents were referred to as "nickels" or "nicks." When the three-cent nickel came onto the scene in 1865, these were the new "nickels" to the common person on the street. In 1866, the Shield nickel was introduced and forever changed the way Americans associated coins made from nickel alloy with a particular denomination.

Kokkuvõttes - mõisted "nickel" kasutati algselt 1 sendise mündi nimeks kuna oli tehtud nikli ja vase sulamist.
Hiljem levis nimetus ka teistele müntidele kuna ka seal hakati kasutama hõbeda asemel nikli ja vase sulamit.