In a recent volume of this Annual (XLV 126 ff.) I discussed the alphabetic numeral system as employed in Attica; in the present article I examine the use of letters in Attica and elsewhere to identify different items, often similar in character and appearance, with a view of facilitating reference and simplifying inventories. For such a purpose letters have certain advantages over other symbols which might be devised; they are brief and familiar and they occur in a recognized order. They thus approach nearly to the use of ordinal numbers (contrasting sharply with acrophonic numerals, which are invariably used to represent cardinal numbers), though it cannot be said that they constitute a numeral system, any more than we could claim that we in English use an alphabetic numeral system because, e.g., a, b, c, d are used on p. 4 below to distinguish four items which might equally well have been numbered 1, 2, 3 and 4. The letters here under consideration were not, and could not be, made the instruments of arithmetical calculation, and the highest number expressed in this way in any inscription known to me is 106 (Inscr. Délos 1432 Aa ii 21; see below, p. 8).
Various scholars have dealt briefly with the subject, but the accumulation of a mass of new evidence calls for a fresh treatment, especially of the part played by such letters in inventories. No technical name has, I believe, been given to letters so used, and in this article I call them ‘letter-labels’, a title which emphasizes the function they fulfil in the majority of cases where they occur.