ECM can mean:

• Every Child Matters, a UK government initiative for children
• Electret microphone, a type of condenser microphone
• Engine Control Module, Car parts related
• Entitlement Control Message, a message carrying conditional access information in a digital broadcast conditional access system
• Error correction mode, a fax protocol
• ECM verb or "Exceptional case marking verb", a linguistic term

Organizations:

• Every Child Ministries, a Christian charity for African children
• European Common Market, the common market of the European Community
• European Congress of Mathematics

Science and mathematics:

• Extracellular matrix, any material part of a tissue that is not part of a cell
• Electrochemical machining, a method of working hard materials
• Electron Cloud Model, an atomic model
• Electronically commutated motor, an electric motor which uses electronic switching to drive the motor rotation
• Electronic countermeasures, a part of electronic warfare
• Electronic control module, a unit to control electrical systems
• Elliptic curve method, an algorithm for integer factorization
• Error correction model

Business:

• Electronic Contract Manufacturing, a term related to the outsourcing of electronic assembly
• Engineering change management, process to control changes in product design
• Enterprise content management, a strategy in the information technology industry
• Equity capital markets, a financial term
• Error Correction Mechanism, a type of econometric model, closely linked with the concept of cointegration
• Explora Capital Management, an investment company

Software:

• Enterprise content management, the capture, management and communication of processes within an organization
• Error Code Modeler, OpenSource software for processing CD images, made by Neil Corlett.

Music:

• ECM (record label), Edition of Contemporary Music, a record label
• Ensemble contemporain de Montréal, Canadian Contemporary Music Ensemble

Medicine

• Erythema chronicum migrans a skin rash associated with Lyme disease

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