  The deconfinement transition in SU(2) gauge theory and the magnetization
transition in the Ising model belong to the same universality class. The
critical behaviour of the Ising model can be characterized either as
spontaneous breaking of the $Z_2$ symmetry of spin states or as percolation of
appropriately defined spin clusters. We show that deconfinement in SU(2) gauge
theory can be specified as percolation of Polyakov loop clusters with
Fortuin-Kasteleyn bond weights, leading to the same critical exponents as the
conventional order-disorder description based on the Polykov loop expectation
value.
