It's often tied with the cathedral Santiago de Compostela, given to pilgrims who make it all the way to the cathedral. The multiple converging lines of the shell have been compared to the multiple pilgrim trails to get to the cathedral from all over Europe.
By attaching it to your heraldry you're stating successful completion of the pilgrimage, or at least trying to make it look like you've gone on the pilgrimage. Later it becomes a symbol of Christianity in general and its meaning becomes more varied.
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A scallop shell
Heraldry is alive and well.
It's called heraldry.
Heraldry came from Ancient Egypt Rome and even England.
Heraldry is tracing a noble family line and having an emblem that was used for flags and armor.