cierni
Cierni is a term that can appear in Polish-language contexts related to the word cierń, which denotes a thorn or sharp projection on a plant or object. In botanical usage, ciernie describe the thorns, spines, or sharp points found on stems, branches, or fruits, and the term is common in field guides and descriptive texts.
In a broader cultural sense, thorn imagery associated with cierń is used in Polish literature and folklore
Geographically and in onomastics, there is no widely recognized settlement or major place simply named Cierni.
Overall, cierni is best understood as a linguistic and cultural extension of the basic meaning of thorn,