letter deity Comment: This is the third of six stages in deity yoga meditation in the Concentration Concentration Tantra (bsam gtan phyi ma, dhyānottara), an Action Tantra: ultimate deity or emptiness deity or suchness deity (don dam pa'i lha, stong pa nyid kyi lha, de kho na nyid kyi lha); sound deity (sgra'i lha); letter deity (yi ge'i lha); form deity (gzugs kyi lha); seal deity (phyag rgya'i lha); sign deity (mtshan ma'i lha).