Tatami mat; traditional Japanese straw mat used as flooring. Rooms are often measured by number of tatami.
和室の畳が新しくなった。
The tatami in the Japanese-style room was renewed.
畳の上に座ってお茶を飲んだ。
I sat on the tatami and drank tea.
この部屋は六畳の広さだ。
This room is the size of six tatami mats.