Bhagavad Gītā Chapter Thirteen Title
kṣetra kṣetrajña vibhāga yogaḥ
The Yoga of the Distinction between the Field and the Knower of the Field.
kśetra - the fieldjña - knowingvibhāga - distinctionyoga - the act of yoking, joining, attaching, harnessing; a yoke, team, vehicle, conveyance; employment, use, application, performance; a means, expedient, device, way, manner, methodCommentaries and Reflections
Commentary by Paul Harvey:
The Yoga of distinction.
What is and what is not Matter.