It was named by his colleague and a science-fiction author Kirill Eskov after fictional entities called sepulki, found in Stanisław Lem's The Star Diaries and Observation on the Spot.
In 2007 Wojciech Orliński published a book "Co to są sepulki? Wszystko o Lemie" ("What are Sepulki? Everything about Lem"), ISBN 8324007989.
The Agora SA edition also contained the "Glossary of Lem's Terminology" ("Słownik terminów Lemowskich") based on the book Co to są sepulki? Wszystko o Lemie (2007) by Wojciech Orliński.