中旬
zhōng xún · HSK 7
middle third of a month
📅 中 (middle) + 旬 (ten-day period) = the middle ten-day stretch of a month
A month splits into three 旬 of ten days: 上旬 first third, 中旬 middle third, 下旬 last third. 旬 itself means a span of ten days, so 中旬 is literally the middle ten-day block, roughly the 11th to 20th.
中 — vertical stroke 丨 through enclosure 口
Pictograph of a banner or pole piercing the center of a target or territory, depicting the idea of 'middle' or 'center'. The horizontal frame represents boundaries, and the vertical line marks the central axis. The meaning extended from spatial center to 'middle, central, China' (中国, the Middle Kingdom).