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20 Lira Al-Khwarezmi
| Issuer | Turkish State Mint (Darphane ve Damga Matbaası Genel Müdürlüğü) |
|---|---|
| Year | 2025 |
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| Thickness | 2.68 mm |
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| Reverse description | The reverse features a finely engraved bust of the 9th-century Islamic mathematician Muhammad ibn Musa Al-Khwarezmi facing left, wearing a turban and draped robe, rendered in high relief against an elaborate geometric Islamic lattice pattern that fills the entire field. To the right of the portrait, a flowchart diagram with rectangular and diamond-shaped decision nodes symbolises the algorithmic concepts pioneered by Al-Khwarezmi. The legend HAREZMI arcs along the upper border within a recessed cartouche, and AL-KHWARIZMI appears in a corresponding cartouche along the lower border, both in raised Latin lettering. The overall design is framed by a plain raised rim. |
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| Reverse lettering | HAREZMİ AL-KHWARİZMİ |
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| Additional information |
Al-Khwarezmi, the 9th-century mathematician working under the Abbasid caliphate in Baghdad, gave algebra its name — the word derives directly from the title of his treatise Al-Kitāb al-mukhtaṣar fī ḥisāb al-jabr wal-muqābala. The word "algorithm" is a Latinized corruption of his own name. Turkey's ongoing commemorative silver program has drawn from Islamic scientific history before, and this issue continues that thread.