Twilight language
Twilight language or secret language is a rendering of the Sanskrit term sāṃdhyābhāṣā (written also sāndhyābhāṣā, sāṃdhyabhāṣā, sāndhyabhāṣā; Wylie: dgongs-pa'i skad, THL gongpé ké) or of their modern Indic equivalents (especially in Bengali, Odia, Assamese, Maithili, Hindi, Nepali, Braj Bhasha and Khariboli). As popularized by Roderick Bucknell and Martin Stuart-Fox in The Twilight Language: Explorations in Buddhist Meditation and Symbolism in 1986, the notion of "twilight language" is a supposed polysemic language and communication system associated with tantric traditions in Vajrayana Buddhism and Hinduism.