<human>:  Why did the ancient Egyptians use the obelisk?
<bot>: The obelisk was used by the ancient Egyptians to commemorate the pharaohs. The obelisk was a symbol of the pharaoh’s power and authority. The obelisk was also used to represent the sun god Ra. The obelisk was a tall, thin, and straight stone column. The obelisk was often used as a funerary monument.