Ars new sign
You're referring to the new sign of the zodiac!
In 2011, the International Astronomical Union (IAU) officially recognized a new constellation, Ophiuchus, as the 13th sign of the zodiac. This decision was made after a thorough review of the ancient Greek constellations and the modern understanding of astronomy.
Ophiuchus is a constellation located between Scorpius and Hercules, and it's represented by the symbol (Ophiuchus). The name "Ophiuchus" comes from the Greek words "ophis" meaning "serpent" and "uchos" meaning "sleeper".
As the 13th sign of the zodiac, Ophiuchus is associated with the period from November 29 to December 17. People born during this time are considered to be Ophiuchans.
Here's a fun fact: Ophiuchus is often referred to as the "13th sign" because it's the only constellation that lies between Scorpius and Sagittarius, which are the traditional signs of the zodiac.