Quadrille Paper, Graph Paper Composition Notebook, Coordinate paper, grid paper, squared paper or math pape
Graph paper 4x4 has many uses. Here are some possible ones:
Mapping for board/video/roleplay games
Tiling or yard landscaping
Playing pen and pencil games
Cross stitch or knitting
Some occupational therapists use squared paper for writing practice:
Artists may use grids to copy pictures.
Engineers and scientists may prefer graph paper for notes that involve formulas.