roll:tldr:a608f
The command "roll ${3d}" is not a standard command in any programming or gaming context. It seems to be an incomplete or incorrect command that is missing crucial information or has incorrect syntax.
In computer programming and gaming, the term "roll" often refers to simulating the outcome of rolling dice. The format for representing dice rolls typically follows XdY, where X is the number of dice and Y is the number of sides on each dice. For example, "2d6" means rolling two six-sided dice.
Based on this convention, it seems like the command you provided should include an integer value for either the number of dice or the number of sides on each dice. Without such information, it is difficult to determine the exact purpose or functionality of the command.