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If you mean symbols for first communion as in Catholic first communion icons, (I apologize if not) then common objects thought of might be the Eucharist, bread, and wine.
strength
His mighty hammer, two robots who helped him walk, and I guess his Cyclopes who watched him as he worked were all his symbols. This might not be accurate though, as there might be many other symbols.
When Okonkwo thought of his father's weakness and failure, he would work and become successful to prove to himself that he is nothing like his father. He would think of his own shows of manliness to silence the thought that he might be like his father.
They are symbols of the dangers of the sea, that a ship or sailor might not return from a voyage.
Yes, they are fine for horses to eat, though some horses might not like them.
Not in human language but they might in horse language.^_^I love horses!
Most Likely, but they might have been descendants from domesticated horses.
Horses might not work because of the versions you are using.
horses are crazy sometimes because you might not be feeding them the right food or they might be in pain or they could be or getting sick. or you might need to train your horse. or something might be irritating it. or it might be hyper!
hay, maybe....
There are many symbols that have no digits. 2 of these symbols might be a dove and a tree for example.