Butter Lamp

 When you travel to Tibet. you will often find a butter lamp as an offering of the light in personal alter in the home, temples, and Monastery. Offering the light to the statue of buddhas and bodhisattvas are said to bring us a positive virtue to wash the ignorance and brings in the wisdom.

https://itibettravel.com/tibet/tibetan-religion/tibetan-buddhism-2/butter-lamp/