Form I-360: Petition for Amerasian, Widow(er), or Special Immigrant
Form I-360, Petition for Amerasian, Widow(er), or Special Immigrant, is used to classify an alien as an Amerasian, the widow or widower of a U.S. citizen, a VAWA self-petitioning spouse, child or parent, or a special immigrant. The USCIS page lists special immigrants such as religious workers, special immigrant juveniles, certain Panama Canal employees, certain physicians, G-4 international organization or NATO-6 employees and family members, U.S. armed forces members, certain Afghan and Iraqi nationals, and broadcasters for the U.S. Agency for Global Media or a grantee.
Some categories are filed by an employer, an organization or another person for a beneficiary, and others are self-petitions. The USCIS page says a person filing for someone else completes Part 1 about themselves and Part 3 about the beneficiary, while a self-petitioner skips Part 1 and completes Part 3.
Each category has its own eligibility list and initial evidence in the instructions. The form also has separate parts that are completed only for an Amerasian, a widow(er), a special immigrant juvenile, a religious worker or a VAWA self-petitioner.