His symbol was the circle.

You see it here." Kit repeated again, slowly: "'He shall lie in peace, encompassed by Ra,' That means surrounded by Ra, doesn't it, Uncle Cassius ?" She picked up the um in both hands and shook it close to her ear.
"My dear child, do be careful," cried the Dean; "it is priceless." But Kit put it under one arm as though it had been a milk pail and tapped around the inside with her knuckles, listening.
"That's a perfectly good hollow jug," she said, solemnly.

"Just you tap it, and listen, uncle.

I'll bet a cookie they've hidden something inside the outside and that Ra has guarded it all these years." "Just a moment, just a moment, my dear," exclaimed the Dean, smiling like a happy boy.

"You've given me an idea.