American Scientists

I found a lot of great information on the set but still nothing of the symbols that is relevant.

http://www.1847usa.com/FamousAmericans.htm

 

All I could find is that it is a symbol of her field, but that is it so far no real answer yet

 

The Alpha and

The Alpha and Omega sign gets my vote

 

i searched and kept getting the greek letter "phi", which has been used, in philosophy, for a generic act. maybe because she did so much they couldn't narrow it down?

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

 

OK here it is, we were right all along.

It is the "phi" which is the symbol for philosophy, her field of study. and the box is just that a box with a dip
The box is also on the right with the 10 cents in it.
Some times we can not see the forrest because there is a tree in front of us.
Now the next question please?