Circle with horizontal strikethrough = London Underground.
I hate this conspiracy bollocks, but there you go.
( Mr. Tea 'ulmmm'/'mmneurgh', Thu 7 Jul 2005, 14:45, archived)

It's quite an interesting example
of how uncannily sensical patterns can appear in complete randomness, if you're looking for them.
( Newington, Thu 7 Jul 2005, 14:54, archived)