Do "alpha females" exist?

Do alpha females exist?
Many people always talk about "alpha" and "beta" males, but do "alpha" and "beta" females?
I honestly don't know.
I do know many women that have the alpha mindset.
My fiancée is one of them - determined, assertive, sexually confident and even aggressive, not regretting anything, not afraid of dirtying her hands or drive away competion, in both the professional and dating world.
What about you? Opinions?
Do "alpha females" exist?
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