I've always loved the ellipsis as a symbol of textual silence.
Here's an account of a surreal dream of being an ellipsis, from the
Will Type for Food blog:
Am suffering from constant
nightmares. I dream I am an ellipsis, coming at the end of a long
short story (or possibly a short long story) by a famous author,
possibly Borges. The story is also a single sentence. I
always wake up, yelling hysterically, and crying; wondering what is to
come next.