The article is devoted to the study of such terms as paranthesis and parenthesis in linguistics, which is associated with the interest of many scientists to the existence of these phenomena. The article considers the limits and approaches to the definition of the concepts of “paranthesis” and “parenthesis” proposed by linguists not only from different eras, but also from different countries. The similarity and difference of the terms “introductory” and “inserted” constructions are analyzed, different classifications of such units are considered. It is said that some linguists do not distinguish between the concepts of “introductory” and “inserted” constructions. The necessity of differentiation between the concepts of “parantez” and “parentez” is substantiated. Furthermore, it is stated that pretention design is a means of formation of individual style of the writer, including the style of V. Korotkevich, which is clearly manifested in the works of art of the author. The use of parenthetical constructions in literary text is an important element in the system of the author’s style, reflects the individual originality of the writer’s manner, helps to focus and keep the reader’s attention on this or that information, which is mandatory for the understanding of the entire text as a whole.