OpenGL

graphics

A cross-language, cross-platform API for rendering 2D and 3D vector graphics via the GPU.

Pronunciation

Correct

open-gee-ell

/ˈəʊpən dʒiː ɛl/

The 'GL' is always spelled out as the letters G and L. Khronos Group's official documentation and speakers say 'open-jee-ell'.

Source: www.opengl.org(official spec)