The Eid stamp is part of the Holiday Celebration Series. Eid is a joyous festival for Muslims, followers of Islam. "Eid al-Fitr" is the celebration that ends the month-long fast of Ramadan. The stamp has the appearance of a holiday greeting card, with "Eid Mubarak," or "blessed festival," written in elegant Arabic calligraphy. There are six million Muslims in the United States and over one billion worldwide.