MATLAB: What does the symbol @ in these products

MATLAB

The first line represents probably the dot product:
dotp = @(a,b)sum(a.*b); % Dot Product
The second line represents probably the cross product:
crossp = @(a,b)a(1,:).*b(2,:)-a(2,:).*b(1,:); % Cross Product
Are the above Matlab's lines work exactly as :
dotp = dot(a,b); crossp = cross(a,b);
Third related question is about the normalization
normalize = @(a)a./repmat(sqrt(sum(a.^2)), [2 1]);
So the core question is : what does @ symbol in the above operations ?!!
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