1) Grid 
• (n.) In drawing and line engraving, shading with lines that cross one another at an angle.
Cross'hatch`ing noun In drawing and line engraving, shading with lines that cross one another at an angle. 
More than one set of close parallel lines that crisscross each other at angles, to model and indicate tone.
a method of shading by using short parallel lines, often in superimposed sets of lines crossed at various angles to darken an area.