NSO

New Student Orientation [en·es·oh] n. the program which seeks to introduce all new students to campus life, formerly called Frosh Orientation, the name was changed to make it more inclusive; occurs a few days prior to the start of Fall Quarter.   See Frosh Orientation.

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Ref:

1. https://www.stanforddaily.com/2018/06/01/new-new-student-orientation-reduces-program-to-four-days-removes-real-world/
2. http://www.stanforddaily.com/2014/10/02/editorial-board-a-new-nso/