Alphabet pasta is pasta that has been mechanically cut or pressed into the letters of an alphabet (Wikipedia, nd).
Allergies to alphabet pasta are directly stemming from the type of pasta used, as well as the other ingredients used when cooking with it. Check the labeling of alphabet pasta carefully before consumption, and if an allergic reaction does occur, contact your allergist.
It is often served in an alphabet soup, sold in a can of condensed broth. Another variation, Alphaghetti, consists of letter-shaped pasta in a marinara or spaghetti sauce (Wikipedia, nd).
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Here is a great recipe for soup made with alphabet pasta.