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From:
NASA Spaceflight.com news letter dated February 18, 2013 by Martin Payne:
http://www.nasaspaceflight.com/2013/02/sls-new-buckling-standards-drops-super-light-alloy/
Martin Payne writes:
"Orthogrids – or possibly isogrid (as shown in the image [here]) – on the tank barrel are machined from flat plates, leaving stiffening ribs that ideally are tall (for strength, or more accurately, stiffness), allowing them to be thin (for lightness)."
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