ALR can refer to different things depending on the context. Here are some possible meanings:

• American Law Reports: ALR is an acronym for American Law Reports, which is a secondary source that provides summaries and analysis of the law in specific areas, along with citations to relevant primary law.

• Administrative License Revocation: ALR can also stand for Administrative License Revocation, which is a civil administrative process that requires the Department of Public Safety to suspend and/or disqualify a drivers license if the driver is arrested for Driving While Intoxicated (DWI) or Boating While Intoxicated (BWI) .

• Ambient Light Rejection: ALR can also refer to Ambient Light Rejection, which is a technology used in projection screens to selectively reflect light back to the audience while limiting the reflection of ambient light from off-axis sources such as lighting and windows.

• Alright: In internet slang, ALR can mean "Alright," which is a popular full form for the term.

It is important to consider the context in which the term ALR is used to determine its meaning.