Word for - an item that belongs to a group or list [closed]

Question

This is one of those word / phrase on the tip of my tongue things.

What is a technical word or phrase for an item that belongs to a group?

Some Context

I am creating a relational table (database) and am trying to add a comment to describe the column as briefly as possible. (Limited to 60 characters.)

Column name: groupid - Sample comment Organizational Group this item belongs to

The point of the comment is to indicate that groupid is a reference meant for visual / organizational purposes only and has no functional purpose in the software.

Not a big issue, just bugging me cause I can't think of the / a word (or better way of stating this).

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I don't know if this helps anyone, but some words floating around in my head right now (as I try to find the right word) are catalog and chronological.

Answer 1

If you're entering cat into the database and the groupin column is to contain mammal, then the appropriate heading might be taxon (too technical?), kind, category, group, etc. Or else element of, member of, ...

(If, however, the question is meant as phrased, then, as Jeff Sahol suggested, member might be right, or element, as these refer to what sets contain.)