Pāli asani
According to Davids and Stede’s Pali-English Dictionary, the Pali word asani means “a sharp stone as a hurling weapon.” In mythology, it refers to “Indra’s thunderbolt, thunderclap and lightning.” It also has cognates in other Indo-European languages. The cognates consist of aśani, aśri meaning “corner” in Sanskrit, ācer meaning “pointed, sharp” in Latin, α῎κρος (a῎kros) meaning “pointed” in Greek, egl meaning “sting” in Anglo-Saxon, and ekka meaning “corner, point” in Old High German. It traces its origin to Tamil akku through the transformation of akku > aṡ > aṡáni > asani. The following words, related to Pali asani, also originate from Tamil akku
asani-aggi, “the fire of thunder, i.e. lightning or fire caused by lightning.” asani-pāta, “the falling of the thunderbolt, thunderclap, lightning.” asani-vicakka, same as asani-pāta.