::placeholder. The ::placeholder pseudo element (or a pseudo class, in some cases, depending on the browser implementation) allows you to style the placeholder text of a form element. As in, the text set with the placeholder attribute: <input type=email placeholder=jane@firefly.com>.
Australian Capital Territories. As of 1996 A.C.T. changed it's name to ACT. It no longer stands for American College Testing since they do so many other things besides just the testing.
PLAN (test) The PLAN is a preliminary ACT test that is generally administered in the sophomore year. ACT, Inc. claims that it predicts success on the ACT. It is viewed as the ACT's equivalent of the PSAT.