low entrance with a tiled archway
Typically found at traditional teahouses, but not exclusively. The entrance is deliberately low, requiring guests to bow upon entering.
Ducking through the low tiled entrance of the tea room, I found myself in another world.
Compound of 瓦 (tile), 灯 (lamp/light), and 口 (entrance). The exact origin is uncertain, but the name likely refers to the tiled archway resembling a traditional lamp or lantern opening.