Noun
HAPO
Acronym of high-altitude pulmonary oedema.
The 2018 Summer Pops concerts are Saturday at 6 p.m. on the HAPO Community Stage, 800 Jadwin Ave., Richland, Washington; and Sunday at 4 p.m. in the Powder River Pavilion at Geiser Pollman Park in Baker City. Source: Internet
The Hapo Over the River Drive-In Air show! Source: Internet