.
To avoid repeating the same discussion, I've written detailed proposals for backslash and tilde. Personnally, I'd prefer backslashes to avoid using an additional ASCII character (they become precious), but tildes would be fine by me too. I expect that changing the current linebreak markup won't be welcome by everyone, but I think alternatives if backslash is the escape character are much worse.
-- YvesPiguet, 2007-Mar-08
For nonbreaking spaces, which are somewhat related, I'd suggest to use naked single underscores. Double underscores would be reserved for engines which support underline.
-- YvesPiguet, 2007-Mar-08
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