Sphere with one squared corner I'm trying to replicate this logo to 3d space but I'm not able to make the last green portion.
Here is an image of the intended result :
You can get close with proportional editing.

Add a UV sphere and rotate it 45° in edit mode
Grab the top point and align it to the top right corner
Check ✓ Proportional Editing &gt; Sharp, adjust Falloff so it fits