Which is an inscription consisting of the letters of an alphabet, almost always listed in order?

An abecedarium (or abecedary) is an inscription consisting of the letters of an alphabet, almost always listed in order. Typically, abecedaria (or abecedaries) are practice exercises.

Some abecedaria include obsolete letters which are not otherwise attested in inscriptions. For example, abecedaria in the Etruscan alphabet from Marsiliana (the Tuscana town) include the letters B, D, and O, which indicate sounds not present in the Etruscan language and are therefore not found in Etruscan inscriptions. Others, such as those known from Safaitic inscriptions, list the letters of the alphabet in different orders, suggesting that the script was casually rather than formally learned.

Some abecedaria found in the Athenian Agora appear to be deliberately incomplete, consisting of only the first three to six letters of the Greek alphabet, and these may have had a magical or ritual significance. A deliberately incomplete abecedarium found at Hymettos in Attica may have been a votive offering.