  Little Higgs models have an enlarged global symmetry which makes the Higgs
boson a pseudo-Goldstone boson. This symmetry typically contains spontaneously
broken U(1) subgroups which provide light electroweak-singlet pseudoscalars.
Unless such particles are absorbed as the longitudinal component of $Z'$
states, they appear as pseudoscalars in the physical spectrum at the
electroweak scale. We outline their significant impact on Little Higgs
phenomenology and analyze a few possible signatures at the LHC and other future
colliders in detail. In particular, their presence significantly affects the
physics of the new heavy quark states predicted in Little Higgs models, and
inclusive production at LHC may yield impressive diphoton resonances.
