The twelve signs of the zodiac are:
* Aries (March 21 - April 19)
* Taurus (April 20 - May 20)
* Gemini (May 21 - June 20)
* Cancer (June 21 - July 22)
* Leo (July 23 - August 22)
* Virgo (August 23 - September 22)
* Libra (September 23 - October 22)
* Scorpio (October 23 - November 21)
* Sagittarius (November 22 - December 21)
* Capricorn (December 22 - January 19)
* Aquarius (January 20 - February 18)
* Pisces (February 19 - March 20)
You are likely thinking of Libra, which is a constellation, and is indeed associated with the zodiac sign Libra. However, it is not a sign itself.