A subgrid is a smaller grid or a part of a bigger grid. It can be thought of as a section or a division within a larger grid or system. Full definition
Now, you have more flexible subgrid positioning for layouts, dynamic calendar icons, and color options for icon labels, tabs, and backgrounds. (androidcentral.com)
Emission associated with subgrid wind fluctuations is dominated by dry convection. (pubs.giss.nasa.gov)
I used subgrid positioning on Nova Launcher to arrange my home screen icons in a gently slanted grid. (androidcentral.com)