In the German language, the name of the letter is pronounced . Following a vowel, it often silently indicates that the vowel is long: In the word ('heighten'), the second is mute for most speakers outside of Switzerland. In 1901, a spelling reform eliminated the silent in nearly all instances of in native German words such as "thun" ('to do') or "Thür" ('door'). It has been left unchanged in words derived from Greek, such as ('theater') and ('throne'), which continue to be spelled with even after the last German spelling reform.