the.com/moire pattern

means An interference pattern of wavy or shimmering lines that appears when two regular patterns (like grids or lines) are overlaid or layered at a slight offset or angle.

from From French 'moiré,' meaning watered or rippled, originally describing a wavy, lustrous finish on silk called 'mohair' cloth — the fabric was pressed with heated rollers to crush the fibers unevenly, producing shimmering bands of light. The term later migrated from textiles into optics and printing, where the same shimmering-band effect turns up whenever fine repeating patterns overlap.