Using numerical value in external's

Hi,

Is it possible to use numerical values in an external statement without invoking an error?
extern bool Fourths_Lines=true; //currently used
extern bool 1/4's_Lines=true; //would like to use something like this

Is this possible? Other options might be 1/4s or 1/4 but would prefer the 1/4's syntax.

Thanks for any and all help with this.

can't use certain characters in variables.

Thanks for the reply...makes sense now why I can't get it to work.