Final answer:
A Buddhist memorial mound erected to enshrine a relic of Buddha is known as a Stupa, a significant structure in Buddhism found throughout Asia, marking sacred spots and commemorating events like Buddha's enlightenment.
Step-by-step explanation:
The Buddhist memorial mound erected to enshrine a relic of Buddha and to commemorate some event or mark a sacred spot is known as a Stupa. The Stupa is a dome-shaped structure originally built as a burial mound for the remains of saints and monarchs. These structures are significant in Buddhism, and they can be found throughout Asia, including the famous Borobudur temple in Indonesia, which stands as the world's largest Buddhist monument. Additionally, stupas often housed relics related to Buddha or were constructed to commemorate significant events in Buddhism, such as the location where Buddha is believed to have gained enlightenment under the Bodhi Tree.