Source : Webster's Revised Unabridged Dictionary (1913)

Caret \Ca"ret\, n. [L. caret there is wanting, fr. carere to
   want.]
   A mark [^] used by writers and proof readers to indicate that
   something is interlined above, or inserted in the margin,
   which belongs in the place marked by the caret.

Caret \Ca`ret"\, n. [F., a species of tortoise.] (Zo["o]l.)
   The hawkbill turtle. See {Hawkbill}.

Source : WordNet®

caret
     n : a mark used by an author or editor to indicate where
         something is to be inserted into a text

Source : Free On-Line Dictionary of Computing

caret
     
        ^
     
        Common: hat; control; uparrow; caret; {ITU-T}: circumflex.
        Rare: chevron; {INTERCAL}: shark (or shark-fin); to the ("to
        the power of"); fang; pointer (in Pascal).