'pch' plot symbol with more than one character

R-help,

Argument 'pch' in 'plot' can only represent a single character.
Is it possible to represent, let's say, two instead?

Thanks in advance.

I'm running on Windows Xp

version

_              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    2              
minor    0.1            
year     2004           
month    11             
day      15             
language R