 It is worth noting that while there are only four mainstream views here (viz., platonism, immanent realism, conceptualism, and nominalism) a fifth view deserves mention, namely, Meinongianism (see Meinong (1904)). On this view, every singular term — e.g., ‘Clinton’, ‘3’, and ‘Sherlock Holmes’ — picks out an object that has some sort of being (that subsists, or that is, in some sense) but only some of these objects have full-blown existence. According to Meinongianism, sentences that platonists take to be about abstract objects — sentences like ‘3 is prime’ and ‘Red is a color’ — express truths about objects that don't exist.