What does AHAU stand for?

Ahtiana aurescens (Tuck.) Thell & Randlane - Scientific name - USDA National Plant Data Center symbol - Taxonomy - Botany - Family: Parmeliaceae (USDA)

Anti-Hemagglutinating Unit (SAUS)

University of Alabama in Huntsville, Huntsville, AL - Library symbol - Library of Congress (LCLS)