• شِيب
• شَيْب
• شَيْبَة

Appears 3 times in the Quran.

1. 19:4 قَالَ رَبِّ إِنِّى وَهَنَ ٱلْعَظْمُ مِنِّى وَٱشْتَعَلَ ٱلرَّأْسُ شَيْبًا وَلَمْ أَكُنۢ بِدُعَآئِكَ رَبِّ شَقِيًّا

   He said: My Lord! surely my bones are weakened and my head flares with hoariness, and, my Lord! I have never been unsuccessful in my prayer to Thee:
   

2. 30:54 ٱللَّهُ ٱلَّذِى خَلَقَكُم مِّن ضَعْفٍ ثُمَّ جَعَلَ مِنۢ بَعْدِ ضَعْفٍ قُوَّةً ثُمَّ جَعَلَ مِنۢ بَعْدِ قُوَّةٍ ضَعْفًا وَشَيْبَةً يَخْلُقُ مَا يَشَآءُ وَهُوَ ٱلْعَلِيمُ ٱلْقَدِيرُ

   Allah is He Who created you from a state of weakness then He gave strength after weakness, then ordained weakness and hoary hair after strength; He creates what He pleases, and He is the Knowing, the Powerful.
   

3. 73:17 فَكَيْفَ تَتَّقُونَ إِن كَفَرْتُمْ يَوْمًا يَجْعَلُ ٱلْوِلْدَٰنَ شِيبًا

   How, then, will you guard yourselves, if you disbelieve, on the day which shall make children grey-headed?