In the present essay the author sets out to reflect on the notions of Firstness, Secondness, and Thirdness, pursuing the research beyond what is directly given in Peirce’s writings. For the purpose, Peircean phenomenology is considered to be a special variety of the Husserlian kind, because it restricts possible phenomena to threesomes and also attributes special contents to the three categories. The first restriction means that Peirce’s theory is a kind of structuralism, although a triadic one, whereas the second restriction implies that it is not merely formal. In the present essay, specific, primitive meanings are assigned to each of the categories, and they are seen to be similar in form to the dyads and triads of social psychology. At the end, signs are considered to be special kinds of Thirds, and an attempt is made to elucidate what hypo-icons owe to Firstness, Secondness, and Thirdness.