Instrument of thought

• An instrument for acquiring knowledge
• Method for acquisition of knowledge
• System of rules abused in Rangoon
• A system of principles for philosophic or scientific investigations

WordNet Word definitions in WordNet
n. a system of principles for philosophic or scientific investigations; an instrument for acquiring knowledge [also: organa (pl)]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Organon \Or"ga*non\, Organum \Or"ga*num\, n. [NL. organon, L. organum. See Organ .] An organ or instrument; hence, a method by which philosophical or scientific investigation may be conducted; -- a term adopted from the Aristotelian writers by Lord Bacon, ...

Wikipedia Word definitions in Wikipedia
The Organon (Greek: Ὄργανον, meaning "instrument, tool, organ") is the standard collection of Aristotle 's six works on logic . The name Organon was given by Aristotle's followers, the Peripatetics . They are as follows:

Wiktionary Word definitions in Wiktionary
n. 1 A set of principles that are used in science or philosophy. 2 The name given by http://en.wikipedia.org/wiki/Aristotle's followers to his six works on logic.