# Webel: SysML4Mathematica: Convention: A prefix 'sym\$' indicates a markup variable "symbol" for a documented variable. It need not be a String, but each referenced part MUST be a String, not a raw Mathematica Symbol, to avoid namespace clashes!

Webel IT Australia promotes the amazing Mathematica tool and the powerful Wolfram Language and offers professional Mathematica services for computational computing and data analysis. Our Mathematica tips, issue tracking, and wishlist is offered here most constructively to help improve the tool and language and support the Mathematica user community.
DISCLAIMER: Wolfram Research does not officially endorse analysis by Webel IT Australia.
Each documented variable may be accompanied by a definition of a markup "symbol" (does not mean a Mathematica `Symbol`) for use in generation of human friendly markup equations. Some examples from the Webel `Psy` library for Psychrometrics in Mathematica:
``````
sym\$psy\$p = "p";
``````

Note how in the above a String "p" is used to avoid clashes with the Symbol `p`.

Where subscripts are used, they MUST also be Strings:

``````
sym\$psy\$m\$wat\$i = Subscript["m","w","in"];
``````
``````
sym\$psy\$m\$a = Subscript["m","a"];
``````
``````
sym\$psy\$w1 = Subscript["w","1"];
``````
``````
sym\$psy\$w2 = Subscript["w","2"];
``````

Defined 'sym\$' markup variables may then be used to create human friendly equations:

``````
eq\$psy\$E\$m\$wat\$i = sym\$psy\$m\$wat\$i ==
psy\$E\$m\$wat\$i[sym\$psy\$m\$a, sym\$psy\$w1, sym\$psy\$w2];
``````

The human friendly Mathematica equation output is:

Note that:

For an example of this convention being used to create an equation registry visit:

This convention works together with:

Relates to