The Nachiarkoil lamp, also called Annam lamp or Nachiarkoil Kuthuvilakku, is an ornamental brass lamp made of series of diyas, a handicraft product which is exclusively made by Pather (Kammalar) community in Natchiarkoil town in Tamil Nadu, India. The lamp, which is hollow cast, is made in different sizes and consists of four parts which are screwed together. The central pillar that crowns at the apex is called the "Prabhai"; it is generally in the form of a hamsa or swan. The lamp may also be made in the form of a female figurine holding a shallow bowl in a standing posture, or in the form of branches of a tree; the bowl of these lamps has five V-shaped spouts which hold cotton wicks, and is filled with oil for lighting. The ornamental lamps are widely used in temples in South India.

A diya, diyo, deya, deeya, dia, divaa, deepa, deepam, deep, deepak or saaki is an oil lamp made from clay or mud with a cotton wick dipped in oil or ghee. These lamps are commonly used in the Indian subcontinent and they hold sacred prominence in Hindu, Sikh, Buddhist, and Jain prayers as well as religious rituals, ceremonies and festivals including Diwali.