A Thiruvachi (or Prabhavali) is a traditional, ornate arch made of brass, copper, or silver placed behind Hindu deity idols in temples and home shrines. It symbolizes a divine aura, light, and celestial energy, enhancing the sanctity of the idol. Common features include intricate carvings and a, mythical face (Kirtimukha) at the top.

• Purpose: Placed behind the Moolavar (main deity) to provide a decorative frame and spiritual focus.
• Structure: Typically consists of an arch with pillars, sometimes attached to a base (Peedam).
• Material: Commonly crafted from durable, high-quality brass, sometimes with a polished or gold-plated finish.