Spelling it out for the people in the back:
This is a section of a photograph that appeared in Playboy, depicting model Lena Forsén. This image was for years used as a reference image for image processing software — comparable to a TV test pattern but for, e.g., the development of JPEG.
Lots of folks think these circumstances are pretty weird for various reasons. The model has requested that the image be retired: "I retired from modeling a long time ago. It’s time I retired from tech, too."