
Front: Atatürk in three-quarter profile, facing left in a dark suit and tie, with the star of the Turkish flag rising behind his head — the standard obverse of every denomination in this rose-red family. The issuer's name runs along the top, the value given twice in figures and once in words as "ON TÜRK LİRASI", above the 1970 enabling-law text, the two signature panels for Başkan and Başkan Yardımcısı, and the printworks line dated 2009. Two raised dots at upper left serve as a tactile mark.
Back: Ord. Prof. Dr. Cahit Arf, 1910–1997, in spectacles and a check jacket, named in small red capitals beside his shoulder. To the left, his own contribution written out as mathematics: the Arf invariant, Arf(q) = Σ q(aᵢ)q(bᵢ) ∈ ℤ₂, with the index line beneath it. Behind, clusters of dots arranged in triangular and columnar counting figures, a nod to number theory rather than to any landscape.
Introduced on 1 January 2009 with the ninth emission group, the series that dropped "Yeni" from the name and replaced the 10 New Turkish lira of 2005. It remains legal tender and in everyday use, so this design has never been withdrawn — only worn down, as this well-creased example shows.