I am a Christian Universalist. Thy don't have any paticular "symbols" except for the Cross. I don't like wearing the Cross that Christ was tortured upon.

The Last Supper

The Gospel of Matthew (26:27) says:[1]
And He took a cup and when He had given thanks He gave it to them saying 'Drink this, all of you; for this is My blood of the covenant, which is poured out for many for the forgiveness of sins. I tell you, I shall not drink again of the fruit of the vine until I drink it new with you in My Father's kingdom.'

This incident, traditionally known as the Last Supper, is also described by the gospel writers, Mark and Luke, and by the Apostle Paul in I Corinthians. With the preceding description of the breaking of bread, it is the foundation for the tradition of the Eucharist or Holy Communion, celebrated regularly in many Christian churches. The Bible makes no mention of the cup except within the context of the Last Supper and gives no significance whatever to the object itself.

St. John Chrysostom, (347-407 AD), in his homily on Matthew asserted:
The table was not of silver, the chalice was not of gold in which Christ gave His blood to His disciples to drink, and yet everything there was precious and truly fit to inspire awe.
Herbert Thurston in the Catholic Encyclopedia 1908 concluded that:
No reliable tradition has been preserved to us regarding the vessel used by Christ at the Last Supper. In the sixth and seventh centuries pilgrims to Jerusalem were led to believe that the actual chalice was still venerated in the church of the Holy Sepulchre, having within it the sponge which was presented to Our Saviour on Calvary.