The sign of summer is represented by four astrological signs: LEO (3 letters), HEAT (4 letters), VIRGO (5 letters), and Thecrab (7 letters). LEO, the fifth astrological sign in the zodiac, is associated with the sun and is known for its fiery energy. HEAT is a common sign of summer, as temperatures rise and the days become longer. VIRGO, the sixth astrological sign in the zodiac, is associated with the harvest season and is known for its practicality and hard work. Thecrab is a symbol of Cancer, the fourth astrological sign in the zodiac, which is associated with the moon and is known for its emotional sensitivity. Together, these four astrological signs represent the sign of summer.