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My respected colleague Dr. Henry just returned from an expedition in the Sahara.

He was hoping to find evidence of a sophisticated ancient civilization, but had little success. However, his team did discover several small artifacts, all in the same area:

Ancient artifacts

I wonder if these artifacts served any purpose. And if so, what?


Update

Hint 1:

If the Saharan civilization was as sophisticated as Dr. Henry believes, they must have developed very advanced mathematics.

Hint 2:

There are exactly two different symbols. What can this mean?

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It's

Pi in binary. http://www.befria.nu/elias/pi/binpi.html The two dots in the center represent the integer part, the marks at the circumference represent the fractional part.

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    $\begingroup$ Remember to add the significance (just in case) - pi is related to the circle as it is the ratio of the circumference to the diameter. $\endgroup$ – somebody Feb 8 '16 at 11:01
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After spending many hours in a haze of glue fumes...

Clearly it's a frisbee!
The assembled artifact

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    $\begingroup$ @Gamow How do you intend to read a sundial while it's spinning through the air towards you? :D $\endgroup$ – Samthere Feb 2 '16 at 11:21
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    $\begingroup$ @Samthere Poor Dr. Henry... he really was hoping to find something extraordinary. I guess a Frisbee is something too $\endgroup$ – Yehuda Shapira Feb 2 '16 at 11:38
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    $\begingroup$ @KateGregory I used something other than Word to put it together better now that I'm home. The two wedge pieces are actually quite different in size; I don't think there's a different way to rearrange it. $\endgroup$ – Samthere Feb 2 '16 at 17:50
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    $\begingroup$ It's an early basketball design, made on a clay plate, but someone misunderstood the difference between blueprint and finished product and dunked it. The elders then decided they needed to focus on education, so basketball had to wait another 4500 years to be re-invented. $\endgroup$ – jhabbott Feb 3 '16 at 19:58
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    $\begingroup$ @Raystafarian the assembled image is correct, but the symbols have not yet been deciphered. I might need to post a hint. $\endgroup$ – Yehuda Shapira Feb 5 '16 at 9:32

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