What does BAQU stand for?

Banded Quail - Common English name - Scientific name: Philortyx Fasciatus - American Ornithologists Union four-character bird identification (IBP)

Barbilophozia quadriloba (Lindb.) Loeske - Scientific name - Botany - Taxonomy - USDA National Plant Data Center symbol - Family: Jungermanniaceae (USDA)