"AGL" is the name of Apple's OpenGL extensions for OS X. I believe "EAGL" is "Embedded AGL".

Alternatively, EAGL is Apple's version of . EGL officially refers to the "Khronos Native Platform Graphics Interface", but earlier versions of the spec referred to it as "Embedded-System Graphic Library". So perhaps the correct answer is that EAGL means "Embedded-System Apple Graphics Library".

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