Guardian Angel
The Guardian Angel is, in Judeo-Christian-Islamic tradition, a celestial being assigned to protect a specific person from birth to death. Doctrine present in Talmud, Bible (Matthew 18:10) and Quran. The kabbalistic tradition assigns 72 angels (the Shemhamphorasch), each governing 5 days of the year — each person has a specific birth angel.
How is the guardian angel identified?
In the kabbalistic system, by birth date: from March 21 begin the 72 angels, each lasting ~5 days. The most popular system in the West.