Flying geese are a widely used subunit in patchwork quilts. Each flying goose consists of a goose triangle (across the width of the block) and two sky triangles (at each side of the block). This instructable shows 3 methods of how to make flying goose blocks.
I don't know where the name comes from but I would think it is the way a skein of geese lines up as they fly across the sky http://www.aerospaceweb.org/question/nature/formation/snow-geese.jpg .
Step 1: Materials and tools
2 or more contrasting fabrics, quilters usually use 100% cotton
a rotary cutter and plastic ruler - or marking pen and scissors
iron & ironing board
washable or air-erasing marking pen