The abbreviation "HR" can have multiple meanings depending on the context in which it is used.
1) Human Resources - This refers to the department within a company that deals with recruitment, management and development of employees.
2) Hours Run - In aviation, this refers to the total amount of time an aircraft has spent flying since its last major maintenance or overhaul.
3) Horsepower Rating - This is used in automotive industry to describe the power output of an engine.
4) Heartbreak Hotel - A popular nickname for a hotel located near Graceland, Elvis Presley's home in Memphis, Tennessee.