Syntax:
>:          pushes 1 onto the stack
^:          clones the current value onto the stack

+:          pops the stack twice and pushes the sum onto the stack
-:          pops the stack twice and pushes the difference onto the stack
*:          pops the stack twice and pushes the product onto the stack

#:          pops the stack and repeats the next operation n times

!:          pops the stack and outputs n as an ASCII character to the standard output 
?:          pushes the next character from the standard input onto the stack

_:          start line  comment

Präprozessorbefehle?! "A()" 

Unused: " $ & ' ( ) , . : ; = @ [ \ ] ` { | } 

Number examples:
1   >
2   >^+
3   >^+>+
4   >^+^+
5   >^+^+>+
6   >^+^>+*
7   >^+^>+*>+
8   >^+^+^+
9   >^+>+^*
10  >^+>+^*>+
72  >^+>+^*>^+^+^+*