A tagset is a list of part-of-speech tags (POS tags for short), i.e. labels used to indicate the part of speech and sometimes also other grammatical categories (case, tense etc.) of each token in a text corpus.
Turkish part-of-speech tagset is available in Turkish corpora annotated by the MaltParser with the pre-trained Turkish model created by Asst.Prof.Dr. Gülşen Cebiroğlu Eryiğit.