signary

noun

Plural: signaries

A system, list or lexicon of all characters or other symbols in a given language or ancient script; alphabet; abecedary.

Examples:

—What does the secret scripture say?— Bruno wondered about the black drawing.
—Huhh... I wish I knew. But I don't think it's writing. Not in the sense of letters of an abecedary or signary. Most likely, we are looking at pictograms. (Context: Dr∙ Barton and his aides are trying to interpret a mysterious sign that appeared on a walled-off door of a haunted house's secret room. Source: J∙ Okram - The Mystery of the Rammed Key.)