Hi Yasser,
You can change the vertices and edges in the icosahedron surface into a "molecule" (dummy atoms and bonds) with the "meshmol" command, and then save the resulting coordinates as a PDB file.

For example, if your icosahedron surface is #0, command:

meshmol #0 0.25

...for bond stick-display radius 0.25; you could use some other number, doesn't really matter if the purpose is to save coordinates. That will create a new molecule model with name "Mesh Icosahedron."
<http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/meshmol.html>

...and then use command "write" or menu: File... Save PDB to save that molecule model.
<http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/savemodel.html#pdb>

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Jun 30, 2020, at 3:05 AM, Yasser Almeida <yasser.almeida@gmail.com> wrote:
>
> Hello,
> I am using the icosahedron surface tool to build a triangulated sphere cage around a model. How can I write its coordinates?
> Thanks in advance,
> Yasser