Housing and Redevelopment Authority, a governmental entity of Bloomington, Minnesota

Human reliability analysis

Hot rolled asphalt

Hindustan Republican Association

HRAS is a human gene that encodes a protein involved in regulating cell division in response to growth factor stimulation. Growth factors act by binding cell surface receptors that span the cell's plasma membrane. Once activated, receptor stimulate...

High Redundancy Actuation, a concept in fault tolerant control

Heritage Railway Association

Hagerstown Regional Airport

Human Rights Act

Home runs allowed

Health Reimbursement Account / Health Reimbursement Arrangement

Holy Royal Arch, a degree and a series of organizing bodies (Chapters) in Freemasonry

Hereditary renal adyplasia, a subtype of Potter Syndrome

Hra, a Finish abbreviation for Herra, similar to Mr.