Claim: UCLUST is an algorithm, a finite sequence of computer-implementable instructions, described by the author as having two simple clustering criteria.
Evidence: In mathematics and computer science, an algorithm (/ˈælɡərɪðəm/ (listen)) is a finite sequence of well-defined, computer-implementable instructions, typically to solve a class of problems or to perform a computation. UCLUST is an algorithm designed to cluster nucleotide or amino-acid sequences into clusters based on sequence similarity. The algorithm is described by the author as following two simple clustering criteria, in regard to the requested similarity threshold T. The first criterion states that any given cluster's centroid sequence will have a similarity smaller than T to any other clusters' centroid sequence.