In Jainism, Ananupurvi means a non-sequential arrangement. In the context of Navkar Mantra, it refers to arranging the padas in different order patterns instead of only reciting them in the usual fixed sequence. It is used as a meditative अभ्यास to improve concentration and prevent the mind from becoming mechanical during जाप. ( jaingpt.org)

If by “Ananupurvi yantra” you mean the diagram/table used for this practice, then it is a Jain meditation arrangement based on such non-sequential permutations of the Navkar Mantra padas. ( jaingpt.org)

If you want, I can also explain the difference between Anupurvi and Ananupurvi in simple Jain terms.