It is a brand name for Japanese tea (Uji tea) taken from Kisen's poem, "My hermitage is at the southeast of the capital, I live like this in the mountain away from the capital, and I turned myself in the mountain since I felt 'U' (hardship) at the everyday world, and that is why people call the mountain 'U'jiyama."
「わが庵は都の辰巳しかぞ住む世を宇治山と人はいふなり」という喜撰の歌から、茶（宇治茶）の銘柄名。