Webel: Psy/MPsy: Psychrometrics for Mathematica: Convention: Option variable names are prefixed with '$opt$psy'
Webel Best Practice: Mathematica: Options are encapsulated as a String variable with the prefix '$opt', and have a related '$info$opt$' String (help), '$lab$opt' String (label), a 'def$opt' default value expression, and an optional '$warn$opt' String.