Acalayoga
The term 'acalayoga' is composed of two Sanskrit words.
acala
mountain; rock; immovable; Siva
yoga
way, method; act of yoking, joining or harnessing; remedy, cure; diligence in the application of thoughts; meditation; union of the individual soul with the Universal; connection of a word with its root
acalayoga is another name for atma vichara (self-enquiry)