The Webel ‘$t$’ “pseudo type” indicator String convention (for optional additional documentation only)

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For reference, the associated policy note (you don't need to visit it yet):

String pseudo "type" indicators are often used in combination with the option '$opt$return' in help registration functions of the HelpF` and HelpO` packages for indicating possible return type or formats of functions or methods in human-friendly form. Their use is entirely optional, and they play no role at all in the code.

They may be also used in combination with 'type$' indicators for Webel '$arg$' and '$opt$' help holders as we'll see in later slides and in a later trail section:

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