Anybody who has ever actually seen an Orange walk will have seen LOL rather than OO on their banners. The acronym isn't some obscure members only thing. Not sure why so many otherwise apparently rational people appear to take leave of their senses when discussing this particular organisation. They don't like the Roman Catholic church. Their reasons for doing so are dated to say the least, but there's nothing inherently wrong with that. I'm more into the Richard Dawkins secular humanist viewpoint on that sort of thing, personally.