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After some research I found it was the Ankh symbol from Egyptian civilization.
We have this conversation on the forum from time to time, as people dream various signs or symbols, and then go looking for a meaning outside of themselves and their own experience.
It is interesting, of course, that what you dreamt has been dreamt before by somebody else, but that happens a lot. Unless you are Egyptian, though, or have some affinity or interest in Egyptian civilization, then what it meant to somebody else long ago is at best a hint about what it may mean to you.
If you have even the slightest interest in Ancient Egypt, though, then you almost surely have seen it before, and just not noticed it. It's all over modern North America, too, in jewelry, advertisements, and so forth. Things we have seen, but not really thought about, are popular dream elements.
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I feel something weird in me for that, like if this sign was spiritual and a call that I need to answer.
Hey, we're spiritual beings.
Everything we do, think, dream, attend to, ignore, ... is spiritual. We can't help it.
BTW, what else was in the sky?