trayam ekatra saṃyamaḥ [YS 3.4]

tad etad dhāraṇādhyānasamādhitrayam ekatra saṃyamaḥ. ekaviṣayāṇi trīṇi sādhanāni saṃyama ity ucyate. tad asya trayasya tāntrikī paribhāṣā saṃyama iti.