What is the symbol for Saint John the Baptist?

an eagle according to my research.

Answer

The Astronomical symbol Aquarius the water bearer.


The answer is actually that he has many symbols, the chief being:
The Head, the Lamb, the Shell [for Baptism], the Holly [for the Passion of Christ which he prefigured], the Maltese Cross, the Reed, from which his own cross was made, the Grasshopper and Camel's Hair. This came from http://www.catholictradition.org/Passion/john-baptist.htm I found this answer while researching for a crossword puzzle in which the answer in the puzzle was lamb.