First, a DataHub point name is not a legal symbol in the Gamma language. A DataHub point names uses a colon (:) to separate the point name from the domain name, and commonly use a dot (.) as well, like this: DataSim:Sine or MyDomain:Plant1.Tank3.Valve2. Colons and dots are not normally allowed in a Gamma variable name, so we use the Gamma symbol character operator $ to turn the whole string of characters into a single, valid Gamma variable. For example, these expressions:

$DataSim:Sine
$MyDomain:Plant1.Tank3.Valve2

are valid Gamma variables.

The $ operator tells the Gamma engine that all characters except white space (space, tab, newline, carriage return, form feed) and the the set: []()",'; are accepted in the symbol name. To get any of the above characters in a symbol name, you need to precede that character by a backslash. So, for example, this DataHub point::

default:plant.water level[1]

would be written in a script like this:

$default:plant.water\ level\[1\]

In brief, you need to put a $ before any DataHub point name in a DataHub script, and use a backslash within the name before any white space or []()",'; character.