It may be a different spelling of recks (meaning break or destroy something) and cranium is someones skull so he may have it on his shirt to show he is dangerous.
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The shirt is called 'Draco Rex', it is seen when the duo perform 'Classico' at the start of the film ''Tenacious D in: The Pick Of Destiny''. Jack Black also wore the shirt at the Marlay Park, Leeds and Reading Festivals in 2008.
Rex Felker's birth name is Rex Anderson Felker.
Rex Grossman's birth name is Rex Daniel Grossman III.
Rex Briggs was born in 1971.
Rex Grignon was born on June 11, 1962, in Ajax, Ontario, Canada.