The Saptamukhi Deepam or 7-faced brass diya is a traditional Indian lamp that holds a deep spiritual significance. Lamps are lit every day at dawn and dusk in Hindu families. There are several interpretitions of the 7 faces/wick cavities of the lamp as a means of offering respects to: 

Seven Chakras in the body
Seven Rishis (Sapta Rishis)
Seven Seas (Sapta Samudra)
Seven Days of the Week 
Seven stages of Life (Saptapadis)
Seven colours of the Rainbow

Buy a traditional 7-Face Brass Lamp with Chain from GiriUK. Crafted in South India, this is also called as Saptamukhi Deepam.