noun: Initialism of Pacific Coast Highway, segments of California State Route 1
noun: Initialism of Packet Clearing House, an Internet infrastructure support organization
noun: Initialism of Patrimoine canadien/Canadian Heritage, the Department of Canadian Heritage
noun: Initialism of Portcullis House, a parliamentary building in London
noun: Initialism of paroxysmal cold hemoglobinuria. [A disease of humans characterized by sudden hemoglobinuria, typically after exposure to cold temperatures.]