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The apple is for donating to 'Books for Schools' program.
The wings are for donating to 'Books for Military' program.
The colored hockey puck thingys are for donating back to PBS, the different colors are different levels
RG is Tour Guide Volunteer
etc. hover your cusor over the symbols and they should say what they are. Then look in the help docs, PBS Icons has a nice chart.
Like Mary posted, if you've donated (or volunteer) for these programs and they are not showing on your posts you will need to contact TPTB. Don't remember how long it takes to appear, but give it a day or so after a donation.