Finsler geometries give natural generalisations of Riemannian
geometries, hence possible natural extensions of their applications.
Many of those make use of symmetries, depending on the physical system
they want to model. In this book we propose a simple method of
imposition of symmetries in Finsler metrics and make use of it to derive
the general form of the spherically and axially symmetric Finsler
metrics in three and four dimensions. Finally, to give an example of
such an application, we derive a spherically symmetric perturbative
non-Riemannian solution for a possible Finsler extension of General
Relativity.