I watched all six seasons, so I hope you don't think me obtuse.... but could you explain what the first, fifth, and sixth symbol are?
The first symbol is the logo for Oceanic Airlines
(Oceanic flight 815), fifth is the Ankh thingy
that can be seen on the giant statue (while it was still standing) and in Hurley's guitar case.
The sixth is the bottle of wine that Jacob shares with Richard, and later with the Man in Black. Jacob uses the wine bottle
to describe the Island to Richard.