Probably old news but I thought it was surprising and even oddly encouraging: Google uses the 2003 RSS instructions from the Harvard Law Berkman Center site to help teach companies to submit product specifications via RSS to its Merchant Center for online sales. Ever confident, Google uses a single "g" to set up its namespaces, even though I believe the spirit of namespace form is to use full words that are clear to human readers without the help of context.

PS. The image shows "RSS" being communicated to us in semaphore.

PPS. In the comments below a seriously well-informed person told me, very politely, that I was mistaken to complain about Google failing to use whole words in namespaces.