Truth, according to philosopher and logician, Gottlob Frege, is the single referent of all true sentences, such "Socrates is mortal" and "All bachelors are unmarried.

A Perl hacker, on the other hand, thinks that truth is anything other than 0 or the empty string "". Contrast this with the shell programmer, who thinks that 0 is true, and every number greater than 0 is false -- the greater the number, the falser it is.