223x -

: It should ideally not be redundant with other features to avoid multicollinearity.

Note: * Points—Features that are too small to represent as lines or polygons as well as point locations (such as GPS observations) CIS 223 : Introduction to Databases - ECPI University

Depending on your specific field, "223x" and "proper features" may refer to:

: Defining a "feature class" which represents a collection of geographic objects with the same geometry type (point, line, or polygon) and the same set of attributes .

: Identifying the correct attributes for entities in an ER Diagram (e.g., a student's ID, name, or enrollment date) to ensure a normalized database structure.