What is this symbol trying to convey???

From: Bryan Hackney (bh.remove_at_bhconsult.com)
Date: 12/31/03 

Date: Wed, 31 Dec 2003 04:16:53 GMT

Apologies to Digikey for linking into their site, but I can't find the original.

This is a Sharp SSR. I bought some - they work fine. What is the symbol on the
data*** trying to say? Pin 5 is labeled G. Pins 6 and 8 are the switched terminals.
I don't understand the parallel triacs and the line between 6 and 5. Anyone?

http://rocky.digikey.com/WebLib/Sharp/Web%20Data/PR3BMF11NSZ.pdf

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