spetsiirkuli
Spetsiirkuli is a term that can refer to a type of specialized or specific circular object or structure. The exact meaning often depends on the context in which it is used. In some technical or engineering fields, a spetsiirkuli might denote a precisely manufactured circular component, such as a bearing race or a ring gear, where the term "spets" implies special or specific purpose and "iirkuli" denotes a circular shape. It could also relate to a specific type of diagram or chart that is circular in design and used for a particular analytical or organizational function.
The term is not widely recognized in common language and likely originates from a specific technical jargon