This is a simple calibration test cube for your 3D printer with X, Y & Z written on the axis.
To further calibrate your 3D printer print one out and you can then measure this models dimensions against the expected dimensions.
Once this is done you are able, if your 3D printer allows it, to adjust your Steps per mm in your printers firmware.
if:
e= expected dimension
o = observed dimension
s = current number of steps per mm
then:
(e/o) x s = your new number of steps per mm
In part though this is the result of a guide on how to make your own 3D printer calibration cube using Freecad ( https://www.idig3dprinting.co.uk/news/how-to-guides/create-a-3d-printer-calibration-cube-in-freecad/ )
So why not have a go at making your own!

This flow test cubes is created to test all kinds of situations, that suffers from under- or overextrusion. It has:
Vertical walls parallel to the axes of printer
Vertical wall at 45° to axes of printer
Vertical rounded walls
Horizontal surfaces with all types of wall connections
Corners of all types
Tiny horizontal surfaces