[sbierwagen]

I read that as meaning "Pale blue dot" in the sense that Carl Sagan wasn't a professional astronomer or a NASA employee, he just said "Hey, wouldn't it be cool if you tried taking a photo of Earth from the Pioneer probe" and they did it.

[ISL]

Sagan was a professional astronomer in Cornell's astronomy department, but his rationale for making the pale-blue-dot image was less as a scientific endeavor and more as a way to tell us more about ourselves.

Incidentally, there was a lot more to that imaging campaign -- Voyager captured a "Family Portrait" of our solar system as its last imaging hurrah: https://en.wikipedia.org/wiki/Family_Portrait_(Voyager)