objExists
objectCenter
objectLayer 
objectType
objectTypeUI
obsoleteProc
| oceanNurbsPreviewPlane
offsetCurve
offsetCurveOnSurface
offsetSurface
openGLExtension
openMayaPref
| optionMenu
optionMenuGrp
optionVar
orbit
orbitCtx
orientConstraint
| outlinerEditor
outlinerPanel
overrideModifier
|
indicates a MEL script