The Seder Table, and especially the Seder Plate, contain several symbols that we explain each year. 

Some go back to the first Seder tables. Rabban Gamaliel said no Seder is complete without explaining the Pesach, the Matzah, and the Maror.

Others are more modern. but no less important.


haggadah Section: -- Cup #2 & Dayenu
Source: Original