Invisible <voi### [at] devnull> wrote:
> \
>     \                    /
>      \                  /
>       \                /
>        \              /
>         ~~~~~~~~~~~~~~
>        /              \
>       /                \
>      /                  \
>     /                    \
>                           \
>
>
> What *is* this mysterious symbol that keeps appearing in XKCD?

http://en.wikipedia.org/wiki/Feynman_diagram

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