This text provides an etymological and philosophical analysis of the Greek term phainomenon (phenomenon), focusing on the challenges of its translation into the Czech language. The author identifies a significant confusion arising from the failure to distinguish between two specific concepts: "jev" and "úkaz." This distinction is rooted in the Greek word for light (phōs), where the verbs phainein and phainestai embody a dual nature. They can refer either to an active source of light that manifests itself or to a passive object that is merely brought into the light by an external source. To achieve terminological clarity, the author advocates for a stricter use of Czech equivalents based on the distinction between active and passive agency. The choice between "jev" and "úkaz" should depend on whether the subject is an active participant in its own manifestation or a passive object being shown. Ultimately, the text seeks to refine these terms to better reflect the ontological status and the active or passive character of how things appear.