We knew them as Jacob's Ladders when we were kids but that usage seems rare now. They're one of the forms of
crepuscular rays, which have many vernacular names: I've most often found them called "God beams". I still prefer "Jacob's Ladders" but admit a fondness for the word "crepuscular".
We saw these at dawn at Flounder Bay last week; this is a cropped telephoto shot. I’d have loved a gannet to have cruised past as I pressed the shutter, but they were too far away to be recognisable as birds. [No—please don’t suggest adding one in Photoshop. :^) ]
All content © 2010 Pete McGregor