Amintaccen tabbataccen abin fashewa yana wakiltar takamaiman nau'i a cikin hanyoyin tabbatar da fashewa, bisa hukuma ana kiranta da 'Safe na cikin ciki,’ kuma ana nuna shi ta alamar “i.”
Wannan nau'in an kasasa shi zuwa matakai daban-daban guda uku: ina, ib, kuma ic, kowanne yana nuna nau'i daban-daban na aminci na ciki.