The term 'Sign of Summer's End' can be summarized by the astrological sign VIRGO, which is represented by the symbol of a woman holding a sheaf of wheat and has five letters. VIRGO is the sixth sign of the zodiac and is associated with the element of Earth. It is known for its practicality, analytical thinking, and attention to detail. VIRGO is also associated with the end of summer, as it is the last sign of the summer season.