that which points out; that which shows, indicates, manifests, or discloses.-that which guides, points out, informs, or directs; a pointer or a hand that directs to anything, as the hand of a watch, a movable finger on a gauge, scale, or other graduated instrument. in printing, a sign  used to direct particular attention to a note or paragraph; -- called also fist.-a table for facilitating reference to topics, names, and the like, in a book; -- usually alphabetical in arrangement, and printed at the end of the volume.-a prologue indicating what follows.-the second digit, that next pollex, in the manus, or hand; the forefinger; index finger.-the figure or letter which shows the power or root of a quantity; the exponent.-to provide with an index or table of references; to put into an index; as, to index a book, or its contents.