This question isn't a good fit for this site. We can't tell you how FamilySearch would like you to index this record -- only FamilySearch can do that.
"What does the 'nE' in the census number column mean?" is a very good question to ask, but you haven't told us what kind of record this is, or what the batch is, or anything that would help us to identify this record.
If you know what kind of record it is, and who holds the originals (where FamilySearch had to go in order to film the record), then you can check the website of the repository to see if they have a reference paper or a scope and content statement that will explain what the abbreviations are. But I can't help you find a reference paper for a document when I don't know what it is. Presumably this is from a Dawes roll, but even my guess is right, any answer I could give about how the record should be indexed would only be my opinion.
I would suggest that you ask FamilySearch, and to gain more experience, to take the Indexing Workshops that are given by the Family History Library in Salt Lake City. You can find the schedule for the Workshops on the Wiki, in the article Family History Library Classes and Webinars. Go to the section marked Indexing Webinars and click on where it says
[show] to open up that section. The Family History Library uses Adobe Connect as its webinar platform, and you can get help on using Adobe Connect here: Quickstart Guide for Participants.
Edited to add: My guess that this might be from a Dawes roll was a bad guess:
US National Archive guide on the Dawes Roll says:
Lists of people accepted between 1898 and 1914 by the Dawes Commission as members of these five Indian tribes: Cherokee, Creek, Choctaw, Chickasaw and Seminole
This image has Blackfeet / Sioux so it must be a different record group.
See the National Archives's page Researching Native American Heritage > Researching an Individual or Family for an overview of record groups held at NARA. It is possible that this is part of NARA's publication m595, Indian Census Rolls, 1885-1940. See: FamilySearch Wiki: American Indian Census Rolls, and U.S., Indian Census Rolls, 1885-1940 at Ancestry.