What the OES means in "GL_RENDERBUFFER_OES"?

Question

I am reading the OpenGL documents from Apple. I noticed that a number of the GL names have the format GL_RENDERBUFFER_OES. What is the meaning of the OES part of these names?

Answer 1

OES is the "vendor"-code for the OpenGL ES working group. OES is used for any extensions that is developed by the working group. This is similar to the ARB-code for desktop-OpenGL.