The phaneron (Greek φανερός [phaneros] "visible, manifest"[1][2]) is the subject matter of phenomenology, or of what Charles Sanders Peirce later called phaneroscopy.
[4] According to Peirce: "By the phaneron I mean the collective total of all that is in any way or in any sense present to the mind, quite regardless of whether it corresponds to any real thing or not.
So far as I have developed this science of phaneroscopy, it is occupied with the formal elements of the phaneron.
[8] The first arises out the thinker's conception of what phenomenology is, which is a study of the possibilities of the consciousness.
[8] Another concern stems from Peirce's belief that we can only study our own consciousness so aside from the previous characterization, he also referred to phaneron as whatever is before the reader's mind.