Native American symbol for Sacred Circle of Life

Welcome Lynn Massachusetts
http://www.ci.lynn.ma.us/
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Is there a native American Indian symbol for sacred circle of life?
To my old discontinued website
http://walkingfox.tripod.com/id11.html
In our area (New England) yours and mine, the old traditional original people held our Paw-paus, you now call powwow, (almost the same thing) on the four seasons in recognition of Creators life circle.
From dust to dust!
This was before any member of India or any other European arrived on American Native Land.
The Circle is the oldest symbol of the world.
The Circle is a reminder of our connections to Mother Earth.
The sun, mood and planets travel in circles.
The Circle is the symbol of the heartbeat of all people.
If you wish to have a symbol of a life circle I would guess that it would be OK to use anything (circle) as your sacred circle of life?