The right answer is Stela.
The Mayan stelae are monuments that have been sculpted by the artists of the Mayan Mesoamerican civilization. These stelae are elongated and often larger than thick stones, which have been carved (most often in bas-relief, but they are also found in high relief, and even some virgins of inscriptions) and placed at the vertical. They are often associated with circular stones called altars, although their real function is uncertain.