What does AR stand for? In the rifle name AR-15, the letters stand for ArmaLite Rifle, after ArmaLite, the small American arms company that designed it in the 1950s. They do not stand for "assault rifle" or "automatic rifle," two guesses that come up often.
AR has plenty of other jobs too. On an envelope it is the postal code for Arkansas, in an office it often means accounts receivable, and in tech it means augmented reality. Context, meaning the nearby words, nearly always settles which one you have.
Quick facts
Stands for
ArmaLite Rifle (in AR-15)Other meanings
Arkansas, accounts receivable, augmented reality, Army RegulationType
Initialism, said A RNot short for
Assault rifle or automatic rifleUsed in
News, firearm catalogs, mail, accounting, techRelated terms
AK, as in AK-47
What does AR stand for in AR-15?
The letters come from the company name, and the number is a design number:
- A and R: ArmaLite Rifle, the maker's own label for its designs.
- 15: the model number in ArmaLite's series. Earlier and later designs used other numbers, such as the AR-10.
ArmaLite sold the rights to the AR-15 design to a larger gun maker near the end of the 1950s. A military version became the M16. Today many companies make rifles in the same general pattern, and "AR-15" or "AR" is used loosely for that whole style of rifle, whoever built it.
So when a news story or a store calls something "an AR-style rifle," it means a rifle built on that same layout. The label describes the design family, not a legal category.
The assault rifle myth
Because the initials match, many people assume AR means assault rifle. It does not. Military writers use "assault rifle" for rifles that can fire fully automatic, and the civilian AR-15 sold in stores fires one shot per trigger pull. The phrase "assault weapon" is a different, legal term that some state and federal laws have defined in their own ways.
Those terms come up in heated debates, and people on different sides choose different words. The letters themselves, though, have a plain origin: they come from the maker's name.
In a news story: "Police said the suspect carried an AR-15 style rifle." Here AR names the design family that began with ArmaLite. It says nothing about whether the rifle is automatic.
Other things AR stands for
Outside the firearm world, AR is one of the busiest pairs of letters in English.
| Field | AR means | Example |
|---|---|---|
| Mail and addresses | Arkansas (USPS code) | "Little Rock, AR 72201" |
| Accounting | Accounts receivable | "AR is chasing three late invoices." |
| Tech | Augmented reality | "The app uses AR to show furniture in your room." |
| US Army | Army Regulation | "See AR 670-1 for uniform rules." |
| Photos and video | Aspect ratio, the shape of the frame | "Export the clip at a 16:9 AR." |
For the state, the Arkansas abbreviation page explains AR versus the older Ark. Many people confuse AR with AK, the code for Alaska.
AR at work: accounts receivable
In a business, the AR team tracks money that customers owe for goods or services already delivered. If a company sends an invoice with 30 days to pay, that amount sits in accounts receivable until the payment arrives. Its opposite is AP, accounts payable, which is money the company owes to others.
A work email: "Please send the signed invoice to AR so they can log it." This means the billing staff who collect payments, not anything about rifles or reality headsets.
More office letters like this are on the business acronyms page. For the main list this page belongs to, see famous acronyms.
AR vs AK and other look-alikes
- AR vs AK: on rifles, the AK in AK-47 comes from Russian words for an automatic rifle named after its designer. AR comes from an American company name. In mail, AR is Arkansas and AK is Alaska.
- AR vs VR: augmented reality adds digital images to the real world you see. Virtual reality replaces your view with a fully digital one.
- AR vs AZ: AZ is Arizona. Arkansas never uses AZ.
When you write the letters, use capitals and no periods. Say "an AR," since the A is spoken as a vowel sound.
Questions people ask
What does AR stand for in guns?
It stands for ArmaLite Rifle, from the company that first designed the AR-15 and AR-10. It does not mean assault rifle or automatic rifle.
What does the AR stand for in AR-15?
AR is ArmaLite Rifle and 15 is the model number in that company's series. People also type it as AR15 or AR 15, and the letters mean the same thing in every spelling. The name is now used for many similar rifles made by other companies.
Is AR short for Arkansas?
Yes, on mail and forms AR is the two-letter USPS code for Arkansas. In running text, writers often use the full name or the older abbreviation Ark.
What does AR mean in accounting?
It means accounts receivable, the money customers owe a business. It appears on balance sheets and in job titles such as AR clerk.
What does AR mean in tech?
AR is augmented reality, which places digital images over a live view of the world, often through a phone camera or special glasses.