<unk>  may refer to: * 4-Hydroxyphenylpyruvate dioxygenase * Hematoporphyrin, organic compound * Histrionic personality disorder * Honda Performance Development *<unk>  series of mines, landmines * New York City Department of Housing Preservation and Development * Croatian Climbing Society (Hrvatsko planinarsko društvo,<unk>
HPD
SimThyr
CAPOX
ADE 
SeHCAT
WikEM
CISEPO
DDAIP