  The nodal $d_{x^2-y^2}$ superconducting gap is a hallmark of the cuprate high
T$_c$ superconductors. Surprisingly recent angle-resolved photoemission
spectroscopy of deeply underdoped cuprates revealed a nodeless energy gap which
is adhered to the Fermi surface. Importantly this phenomenon is observed for
compounds across several different cuprate families. In this letter we propose
an exciting possibility, namely the fully gapped state is a topological
superconductor.
