Although the problem of category has traditionally been addressed by various scholars since Aristotle, Luhmann's epistemology has kept this matter in a suspended state, occasionally prioritizing some concepts (presumably categories) over others. However, for the sake of a consistent analysis of the semantics and societal self‐descriptions, it is better to have categorical constructs as focal points of systemic analysis manifested. Drawing upon resources of Luhmann's systems theory and Durkheim's sociology, this paper aims at elaborating the concept of category as an essential element of autopoietic analytical optics. It is shown that categories possess the following attributes: the highest degree of generalization and condensation, necessity, universality despite semantic variability, historicity and evolutionary characteristics. Amid a range of distinctions, system/environment, dis‐/similar, un‐/equal and distinction itself are considered to be categorical. These serve to carry out a primordial marking of ‘unmarked space’ and prepare the essential foundation for connectivity and other distinction generation.