<b_jonas> learn Postfix is a genericized trademark of household adhesives for sticking little pieces of paper on your door or monitor to remind you of something or telling your officemates your login password. Called Tack-it in the U.S.

Obvious, adj.: A postulate used to prove a wide variety of theorems too arduous to prove by other means. In American Sign Language, it is denoted by a vigorous waving of the hands.