One day Mahāmudrā....

Mahāmudrā (Sanskrit; Tibetan: Chagchen, Wylie: phyag chen, contraction of Chagya Chenpo, Wylie: phyag rgya chen po) literally means "great seal" or "great symbol." It "is a multivalent term of great importance in later Indian Buddhism and Tibetan Buddhism" which "also occurs occasionally in Hindu and East Asian Buddhist esotericism."[1] The name refers to the way one who has realized mahāmudrā (that is, one who has succeeded in the practices of mahāmudrā) experiences reality: mudra refers to the fact that each phenomenon appears vividly, and maha refers to the fact that it is beyond concept, imagination, and projection.