  We demonstrate that world-volume actions describing probe branes in anti de
Sitter space have an infinite-dimensional symmetry algebra that is reminiscent
of Yangian symmetry. Two essential ingredients are responsible for this
symmetry. The first is an inversion symmetry of anti de Sitter space. The
second is the compensating gauge transformations that are required to properly
describe global symmetries after gauge fixing the general coordinate
invariance.
