After repeated Google searches off and on for most of the day, I have found exactly ONE - as in ONE - web site containing information about and pictures of the linocut thingie. And I knew what I was looking for. This includes searches on several 'international symbol dictionary' type sites. I'm rather impressed with myself - I knew they were obscure, but not THIS obscure.
If anyone's near a library, y'all might want to hit some books. Even if you don't find THIS information, I'm sure you've all learned many fun things, already. Like maps of public toilet facilities in Australia.
Oh, and Alwen, a search of Google Books turned up nothing USEFUL, but cracked me up all the same. Remind me when the contest is over, I'll tell you the whole story.