samaya-mudrā  (Sanskrit) Seal of Symbols; one of the four meditation seals (mudrā) according to yoga-tantra. It refers to the process of imaging the Buddhas in transformational meditation practice by way of symbolic emblems which correlate to their mind aspect (see body, speech, mind).

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)

dam tshig gi phyag rgya

[translation-san] {LCh} samaya-mudrā

[translation-eng] {Hopkins} pledge seal

Jeffrey Hopkins' Tibetan-Sanskrit-English Dictionary