Well, if you are talking about C.M.Russell or CMR in Great Falls, Montana. The skull is of a cow. It was one of the first things Charlie saw when looking out of his train and from then on he would put the skull by his name in every picture and that became the school's logo or symbol.
Baliati I. C. High School was created in 1919.
A. C. Reynolds High School was created in 1955.
William C. Hinkley High School was created in 1973.
E. C. Drury High School was created in 1980.
John C. Fremont High School was created in 1924.
Iver C. Ranum High School was created in 1961.
Sol C. Johnson High School was created in 1959.
Wellington C. Mepham High School was created in 1935.
C. K. McClatchy High School was created in 1937.
T. C. Roberson High School was created in 1962.
Robert C. Byrd High School was created in 1995.
Tom C. Clark High School was created in 1978.