To print the size of your selection:
// Simply use the size command combined with the return of the list selected command
size(`ls -selection`) ;
To print what is currently selected:
// Use the LS command to list your selection
ls -selection ;
// Or print it... (same thing)
print `ls -selection` ;
// What about vertices? (faces, etc.)
// ls -selection ; will usually return a next to useless result with multiple verts selected.
// Instead add another flag, -flatten
ls -selection -flatten ;
Any questions? Please comment below.