What is "al-nasa'i"

Al-Nasā'ī (214 – 303 AH; 829 – 915 CE), full name Aḥmad ibn Shu`ayb ibn Alī ibn Sīnān Abū `Abd ar-Raḥmān al-Nasā'ī, was a noted collector of hadith (sayings of Muhammad), and wrote one of the six canonical hadith collections recognized by Sunni Muslims, Sunan al-Sughra, or "Al-Mujtaba", which he selected from his "As-Sunan al-Kubra". He also wrote 15 other books, 6 dealing with the science of hadith.