窗口
chuāngkǒu · HSK 6
window
🪟 窗口 = 窗 (window) + 口 (mouth/opening) — a window-opening
窗 means window; 口 literally means mouth but extends to any small opening or aperture. Together 窗口 names a window-shaped slot — hence ticket window, service counter, or a UI window on a screen.
口 — pictograph of an open mouth
口 is one of the oldest pictographs in Chinese, originally drawn as a simple outline of an open mouth. Its core meaning 'mouth' extended naturally to 'opening' or 'entrance', as in 入口 (entrance). It also serves as a common radical in characters related to speech, eating, or apertures.