What is this pattern symbol used for
{"Image DocumentName": "What is this pattern symbol used for?", "Image ImageDescription": "Dots and squares. Transfer to fabric for use in matching pattern pieces.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}