We learn some things from gesture (ceṣṭā), such as to come when beckoned by a conventionalized movement of the hand. Gaṅgeśa says this is an aid to testimonial knowledge, not really a form of it since it depends on other semanitc items, he says, being supplied  (Tattva-cintā-maṇi, testimony chapter, 922–926). Rumor (aitihya) is defined by Vātsyāyana (under Nyāya-sūtra 2.2.1) as a testimony chain whose originator is unknown. The Nyāya attitude is to regard even it as presumptively veridical in consonance with the school’s overall theory of testimony.