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(SIASL)² or siasl2 is the follow-up language to SIASL. 
Their design is somewhat similar but (SIASL)² is much richer. 
and has a important differences with SIASL.

Like SIASL (SIASL)² is a turing tarpit inspired by brainfuck. 

a program a set on instructions applied on a 2d grid. 
However, (SIASL)² doesn't work the way siasl does. 

An instruction/symbols in (SIASL)² is 2 characters instead of one. 

Some instruction/symbols  are predefined and are immutable some other can be user defined. 

To learn more about how (SIASL)² works and how to write (SIASL)² programs; please check out the 
docu/docu.html file.

To compile the (SIASL)² interpreter you'll need flex, bison ,gcc and make.

If you have all of these installed on your computer simply type 
"make siasl2" in the siasl2 directory to copile the interpreter.

once compiled the siasl2 interpreter can be called with arguments : 

-c loads the command line interactive interpreter 
-s starts (SIASL)² with bf-like symbol lexic.
-f reads a program from a file
-h prints out help 
-x starts (SIASL)² with an hexadecimal lexic instead of normal bf-like symbols 
   nb: hexsiasl's current implementation is pretty awful and has worse performance than normal
       (SIASL)²

the default behavior of siasl2 when executed is to load the command line interpreter with the 
bf-like lexic (-sc)

If you call (SIASL)² with mutually exclusive options (like -sx) , the LAST one passed will be the 
one used at runtime.