Actually, just the left hand side of the equations, because it looks better that way. The right hand sides are just a click away.
E and B are the electric and magnetic fields, respectively. ∇ is the “del” operator.
The divergences ∇ · E and ∇ · B are the “fields emanating from the sources.”
The curls ∇ x E and ∇ x B are the “circulation of the fields.”