the fruit of the prickly pear cactus (tuna in Spanish)
See an image that represents nochtli in the Visual Lexicon of Aztec Hieroglyphs, ed. Stephanie Wood (Eugene, Ore.: Wired Humanities, 2020-present).
yn yancuican neci nochtli in centetl cacauatl quinamiqui in ihquac vel onezqui Hontetl yn nochtli = A newly picked prickly pear cactus fruit is equivalent to one cacao bean, when fully ripe two cactus fruit (for a cacao bean)
In place names, "noch" can refer to the cactus or the fruit of the cactus. For instance, Tenōchtitlan can be translated "By the Rock Cactus."