The sign for "Africa" has gone through a few political debates.
A long time ago it was an
"A" circling the face.
Then people started using a "loose C" handshape that uses a curved downward motion
into an "AND" handshape. (Which was considered politically correct
and respectful since it was linked to the shape of the African continent and
not linked to people's faces).
Some people go on a tirade if you don't sign things their
way. If people in your social circle sign it one particular
way, by all means adopt that method but as for me, I recommend you
do it the "newer way"