And &quot;tty&quot; = &quot;teletype terminal&quot;. We use &quot;glass ttys&quot;, which emulate the older mechanical ones.<p>My favorite old term, which is still used at times, is &#x27;false drop&#x27;. (Eg, see <a href="http:&#x2F;&#x2F;www.researchinformation.info&#x2F;features&#x2F;feature.php?feature_id=528" rel="nofollow">http:&#x2F;&#x2F;www.researchinformation.info&#x2F;features&#x2F;feature.php?fea...</a> .) The term comes from the days of <i>manual</i> punched cards, using edge-notched cards, where you would stick a needle through a given position deck of cards and lift. The cards with the notch at that position would fall out. Those with a hole would stay. Hence, the cards you want &quot;fall out&quot;.<p>But if you used multi-punch encoding (eg, encode two rare terms to a single location) in order to decrease the number of holes required, then you might get some &quot;false drops&quot;.<p>Nowadays we mostly say &#x27;false positives&#x27; for this case.