White cotton Janeu, also known as the sacred thread or the sacred thread of the Brahmins, holds significant religious and cultural importance in Hinduism. It is a symbol of initiation and is worn by individuals during certain rituals and ceremonies. Here are some key aspects related to the white cotton Janeu:

1. Initiation and Symbolism: The white cotton Janeu is traditionally given to Brahmin boys during their Upanayana ceremony, which marks their initiation into the study of Vedic scriptures. It is believed to symbolize the sacred connection between the wearer and the divine, as well as their commitment to learning and practicing spiritual values.
2. Purity and Simplicity: The use of white cotton for the Janeu represents purity and simplicity. Cotton is considered a natural and pure material, symbolizing the wearers commitment to leading a pure and simple life, free from material attachments.
3. Three Strands: The Janeu typically consists of three strands of cotton thread, which are twisted together to form a cord. Each strand represents the three deities of Hinduism: Brahma (the creator), Vishnu (the preserver), and Shiva (the destroyer). The three strands symbolize the unity of these divine forces and the interconnectedness of the universe.
4. Spiritual Protection: The Janeu is believed to provide spiritual protection to the wearer. It is seen as a sacred thread that forms a protective shield around the individual, guarding them against negative influences and promoting spiritual well-being.
5. Reminder of Duties and Responsibilities: Wearing the white cotton Janeu serves as a constant reminder of the wearers duties and responsibilities. It symbolizes their commitment to upholding moral and ethical values, adhering to religious rituals, and performing their prescribed duties in society.

Its important to note that the significance and practices associated with the white cotton Janeu may vary among different regions and sects within Hinduism. The specific rituals, rules, and cultural interpretations can differ. Its advisable to consult with a knowledgeable religious authority or cultural expert to understand the specific practices and customs related to the Janeu in your particular context.