Hanuman Sindoor is a red-colored powder or vermilion that is believed to be associated with Lord Hanuman, a prominent deity in Hindu mythology. It is considered sacred and is often used in religious ceremonies and rituals, especially those dedicated to Lord Hanuman. Devotees apply it as a tilak (a mark on the forehead), particularly on Tuesdays and Saturdays, which are considered auspicious days for worshipping Lord Hanuman. The application of Hanuman Sindoor is believed to bring protection, strength, and blessings from Lord Hanuman. It's a significant part of devotional practices for many followers of Hinduism.