ABCD

ABCD is a list of the first four letters in the English alphabet. It may also refer to:

Medicine

ABC (medicine), also known as ABCD, a mnemonic for steps in resuscitation
ABCD rating, a staging system for prostate cancer
ABCD syndrome, a genetic disorder
ABCD guideline, a heuristic for detecting melanomas
ABCD² score, a score for determining the risk of stroke after a transient ischemic attack (TIA)
ABCD1, a protein

ABCD matrix analysis, a type of ray tracing technique used in the design of some optical systems
ABCD-parameters, a type of properties describing the electrical behavior of linear electrical networks
ABCD Schema, a highly structured data exchange and access model for taxon occurrence data (specimens, observations, etc. of living organisms), i.e. primary biodiversity data

ABCd, American streaming service
Action for Boston Community Development, a Boston, Massachusetts-based non-profit social services agency
Asset-based community development, a methodology that seeks to uncover and highlight the strengths within communities
CompTIA, also known as the Association of Better Computer Dealers
ABCD Region, an industrial district outside of São Paulo, Brazil
American-Born Confused Desi, refers to American youth of South Asian descent
ABCD: add, browse, change, delete, another representation of Create, read, update and delete
ABCD line, a Japanese term for embargoes placed against Japan by the Americans, British, Chinese and Dutch, as well as other countries
ABCD ships, The first four steel ships built during the "New Navy" period of U.S. Naval history - Atlanta, Boston, Chicago and Dolphin
Four major agriculture commodity companies

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