入隅・入角(いりすみ)irisumi
箱の側面などの角の部分を突出させず、円みを帯びさせて溝状に窪ませる技法。
第70回 正倉院展、2018年
Irisumi
The inner corner where two walls or boards meet. In boxes it also refers to an indented as opposed to protruding side corner.
60th Annual Exhibition of Shōsō-in Treasures, 2008