The title is the innocuous official NASA catalogue reference for this image on the left, one of my favourite photos of all time.
It is so iconic, showing Edwin "Buzz" Aldrin, on the moon, that it has almost become a cliche. Yet, look at it again with fresh eyes, and admire it from a photographic perspective. It is simply astonishing. The strong light from the sun, the reflection of Armstrong in the visor taking the photo, the LEM nearby, the footprints in the dust, the pure blackness of space around - it all adds up to one of the most powerful images in human history.
I wholly encourage you to look at the large version on the NASA website, even if you've seen it all before:
