Bell pepper filled a long, oddly specific gap — until 2021 (Unicode 13.1) there was no non-spicy pepper emoji distinct from the hot chili, which frustrated cooking and grocery-list posters. It's used almost purely literally for the vegetable in salads, stir-fries, or grilling posts, and is typically drawn in its classic green or red bell shape.
Keywords: bell, capsicum, food, pepper, vegetable