The term "tulku" in Tibetan Buddhism refers to a reincarnated master, who is believed to be the rebirth of a previous enlightened teacher. It is a title given to highly realized masters who have the ability to consciously choose their rebirth in order to continue their spiritual work and guide others on the path to enlightenment.

In Tibetan culture, the belief in reincarnation is deeply ingrained and the recognition of a tulku is a highly revered and sacred process. The search for a tulku begins with the passing of a master, where their students and disciples will look for signs and clues that may indicate the master's rebirth. These signs can include dreams, visions, and other auspicious occurrences.

Once a potential tulku is identified, they undergo a series of tests and examinations to confirm their identity as the reincarnation of the previous master. This process is known as the "tulku recognition" and is overseen by a committee of senior lamas and scholars.

The significance of the term "tulku" lies in the belief that these masters possess a deep understanding of the nature of reality and have achieved a high level of enlightenment in their previous life. As such, they are seen as living Buddhas and are highly respected and venerated by their followers.

Tulku Urgyen Rinpoche, a Tibetan Dzogchen master, was recognized as the reincarnation of the renowned teacher, Chokgyur Lingpa. He was highly regarded for his profound understanding of the Dzogchen teachings and his ability to transmit them to his students with great clarity and simplicity.

The tulku tradition in Tibetan Buddhism serves as a means of preserving and continuing the teachings of past masters, ensuring that their wisdom and guidance are not lost. It also serves as a reminder of the impermanence of life and the cyclical nature of existence.

In conclusion, the term "tulku" holds great significance in Tibetan Buddhism as it represents the continuation of the enlightened teachings and the embodiment of wisdom and compassion in the form of a reincarnated master. The recognition and reverence of tulkus play a vital role in the spiritual development of their followers, as they serve as living examples of the path to enlightenment.