是 ETA-750B - 回复：请教老师们:ER-750是什么? 楼下有人说NiW需要这个.多谢

USCIS - "If you are a worker with exceptional ability in the sciences, arts, or business, you may apply to waive the requirement that you have a job offer if such a waiver would be in the national interest. To apply for a national interest waiver, you must submit Department of Labor Form ETA-750B. Please see the Department of Labor's Employment and Training Administration for more information."
见 Application Procedures 之第三段

Or google "NIW ETA-750B"