The Mimamsa school has several subschools defined by epistemology. The Prabhakara subschool of Mimamsa considered five epistemically reliable means to gaining knowledge: pratyaksa (perception), anumana (inference), upamana (comparison and analogy), arthapatti (postulation, derivation from circumstances), and sabda (word, testimony of past or present reliable experts). The Kumarila Bhatta sub-school of Mimamsa added sixth to its canon of reliable epistemology - anupalabdi (non-perception, negative/cognitive proof).

Answer this question, if possible (if impossible, reply "unanswerable"): What does Mimamsa mean?
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