Scope note: This class comprises discrete, identifiable man-made items that are documented as single units. These items are either intellectual products or man-made physical things, and are characterized by relative stability. They may for instance have a solid physical form, an electronic encoding, or they may be logical concepts or structures. Examples: - Beethoven's 5th Symphony (E73) - Michelangelo's David - Einstein's Theory of General Relativity (E73) - the taxon 'Fringilla coelebs Linnaeus, 1758' (E55) In First Order Logic: E71(x) ⊃ E70(x)