数字 here means 'numbered' — Chinese tech media calls Xiaomi's main flagship line the
数字系列 because each generation is simply the next integer (
小米10, 11, 12, 13, 14, 15). Distinct from the Redmi Note numbered line, the Xiaomi Civi women-focused line, and the Mix innovation line. The numbered series is where Xiaomi usually debuts Leica-tuned cameras and top-tier Snapdragon chips.
