The difference between Mercurial finger and Pinkie
When used as nouns, mercurial finger means the little finger, whereas pinkie means a little finger, the finger furthest on a hand from the thumb.
check bellow for the other definitions of Mercurial finger and Pinkie
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Mercurial finger as a noun:
the little finger
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Pinkie as a noun (anatomy):
A little finger, the finger furthest on a hand from the thumb.
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Pinkie as a noun (anatomy, less commonly):
A little toe, the toe furthest on a foot from the big toe.
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Pinkie as a noun (Australia, South Australia):
A bilby.