While waiting for Jen to return from a conference, I thought about calling her to get her estimated time of arrival, or her ETA. I realized she might be might be pretty far away still and thought I better ask for an estimate of the accuracy of the estimate, or meta-estimate: her META. Hey, neat! META can be a recursive acronym for "meta-ETA", so it also references the nature of the acronym itself, sort of making META a meta-acronym, which truly makes it both meta and META.