Wiktionary
subgrid
a. (context mathematics physics English) Describing any parameter measured on a scale smaller than the grid used to plot it n. A grid comprising a subset of the contents of a larger grid.
Usage examples of "subgrid".
They completed a subgrid of only four: Go, Go-bang, Yote and tic-tac-toe.
The alien could choose INFORMATION, and the subgrid could put them into planetary history, where Noh could be well prepared.
They assembled the nine-square subgrid and chose, and came up with Original Story telling.
In the subgrid she chose COOPERATIVE, while he went again for immediacy and challenge.