The German Orthographic Conference of 1901 (the Berlin II Orthographic Conference; German: Zweite Orthographische Konferenz or II.
The conference results removed numerous existing variant forms.
The Erziehungsrat des Kantons Zürich stopped the teaching of ß in schools in 1935 with the Canton of Zürich being the first to do so, and the Neue Zürcher Zeitung as the last Swiss newspaper stopped using ß in 1974.
The IETF language tags have registered de-1901 for "Traditional German orthography".
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