The gate radical. Traditional 門 is a pictograph of two swinging double doors; simplified 门 keeps a stylized single panel. Highly productive as an enclosure: phonetics drop into the doorway and most characters relate to opening, closing, gates, or what passes through them: 问 (ask), 间 (between), 闻 (hear), 闭 (close), 开 (open), 闯 (rush in), 闹 (noisy).