AAD may refer to:

Organizations

* ''Ad Altare Dei'', a Boy Scouts of America award *

Advanced Automotive Design Advanced Automotive Design (AAD) is a South African automobile and kit car manufacturer located in Die Wilgers, Pretoria. The company was founded in 1995 by Brian Glover and Rhys Edwards. Shaka is a registered Trademark of the AAD. Rhys Edwards le ...

, a South African car manufacturer *

Ardent Leisure Coast Entertainment Holdings Limited (formerly Ardent Leisure Group and Macquarie Leisure Trust) is an Australian leisure company. It is most known for its operation of the Dreamworld (Australia), Dreamworld theme park and the WhiteWater World w ...

, an Australian-based leisure company * AAD Education, Health and Sports (formerly, Athletes Against Drugs), an organization founded by Stedman Graham *

American Academy of Dermatology The American Academy of Dermatology (AAD) is a non-profit professional organization of dermatologists in the United States and Canada, based in Rosemont, Illinois, near Chicago. It was founded in 1938 and has more than ''21,000'' members. The Acad ...

Australian Antarctic Division The Australian Antarctic Division (AAD) is a division of the Department of Climate Change, Energy, the Environment & Water. The division undertakes science programs and research projects to contribute to an understanding of Antarctica and the S ...

, which manages Australia's four Antarctic/sub-Antarctic stations, as well as Heard Island

Science and technology

* Average absolute deviation, a measure of

absolute deviation In mathematics and statistics, deviation serves as a measure to quantify the disparity between an observed value of a variable and another designated value, frequently the mean of that variable. Deviations with respect to the sample mean and th ...

and a way to report error against reference data in statistics

Aviation

* Advanced Air defence, an anti-ballistic missile in the

Indian Ballistic Missile Defence Programme The Indian Ballistic Missile Defence Programme is an initiative to develop and deploy a multi-layered ballistic missile defence system to protect India from ballistic missile attacks. It was launched in 1999 after the Kargil War by the Atal B ...

* Africa Aerospace and Defence Expo, a biennial trade show in South Africa *

Automatic activation device In skydiving, an automatic activation device (AAD) is a dead man's switch consisting of an electronic-pyrotechnic or mechanical device that automatically activates the opening sequence of the main or reserve parachute container when the AAD is f ...

, a fail-safe device often used in a parachute pack * IATA airport code for

Adado Airport Adado Airport , also known as Cadaado Airport (), is an airport serving the town of Adado in Adado District, Somalia. Adado Airport is the largest functional airport in Galmudug State of Somalia. Airlines and destinations See also * * * L ...

in Galguduud Region, Somalia

Computing

* aad, or "ASCII Adjust before Division", one of the

Intel BCD opcodes The Intel BCD opcodes are a set of six x86 instruction (computer science), instructions that operate with binary-coded decimal numbers. The radix used for the representation of numbers in the x86 central processing unit, processors is 2. This is c ...

* AAD, the

SPARS code The SPARS code is a three-position alphabetic classification system developed in the early 1980s by the Society of Professional Audio Recording Services (SPARS) for commercial compact disc releases to denote aspects of the sound recording and rep ...

for a CD that was recorded analog, mixed analog, and transferred digitally *

Additional authenticated data Authenticated Encryption (AE) is an encryption scheme which simultaneously assures the data confidentiality (also known as privacy: the encrypted message is impossible to understand without the knowledge of a secret key) and authenticity (in othe ...

passed to an "Authenticated Encryption with Associated Data" (

AEAD Authenticated Encryption (AE) is an encryption scheme which simultaneously assures the data confidentiality (also known as privacy: the encrypted message is impossible to understand without the knowledge of a secret key) and authenticity (in othe ...

) block cipher mode of operation * Microsoft

Azure active directory Microsoft Entra ID (formerly known as Microsoft Azure Active Directory or Azure AD) is a cloud-based identity and access management (IAM) solution. It is a directory and identity management service that operates in the cloud and offers authent ...

Medicine

Antibiotic-associated diarrhea Antibiotic-associated diarrhea (AAD) results from an imbalance in the colonic microbiota caused by antibiotics. Microbiotal alteration changes carbohydrate metabolism with decreased short-chain fatty acid absorption and an osmotic diarrhea as ...

7-Aminoactinomycin D 7-Aminoactinomycin D (7-AAD) is a fluorescent chemical compound with a strong affinity for DNA. It is used as a fluorescent marker for DNA in fluorescence microscopy and flow cytometry. It intercalates in double-stranded DNA, with a high affin ...

(7-AAD), a fluorescent stain for DNA * Acute aortic dissection, a type of

Aortic dissection Aortic dissection (AD) occurs when an injury to the innermost layer of the aorta allows blood to flow between the layers of the aortic wall, forcing the layers apart. In most cases, this is associated with a sudden onset of agonizing ches ...

* Antiarrhythmic drug, another name for

antiarrhythmic agent Antiarrhythmic agents, also known as cardiac dysrhythmia medications, are a class of drugs that are used to suppress abnormally fast rhythms (tachycardias), such as atrial fibrillation, supraventricular tachycardia and ventricular tachycardia. M ...

Other uses

Amal language Amal is a language spoken along the border of Sandaun Province and East Sepik Province, Papua New Guinea, along the Wagana River near the confluence with Wanibe Creek. Foley (2018) classifies Amal as a primary branch of the Sepik languages, tho ...

, a language of Papua New Guinea *

Attitude-toward-the-ad models Attitude-toward-the-ad models explore how a person's feelings about an advertisement, known as "attitude toward the ad" (Aad), shape their response to it. Aad is defined as a tendency to react favorably or unfavorably to a specific ad during a giv ...

in marketing is a way of measuring the success of an advertisement