窓口
まどぐち · madoguchi · JLPT N2 · noun
window
🎫🪟 窓 (window) + 口 (mouth/opening) = the opening where you get served at a counter
口 means mouth or opening, so 窓口 is a window-shaped opening for transactions. It is the counter where tickets or services are handled.
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.