Try these designs at $1 each
Continuing from Kylasm's reply, here is a link for you.
When I put Delta into my 4D software this is what came up on the screen. I can do an embroidery for you but not an applique. It sounds like you are looking for one letter, and I have the alphabet. Hugs, Judy
Embroiderydesigns.com has about 27 designs of the greek delta, applique and stitched designs. Buzztools.com has a free greek alphabet, stitched.