The d in front of the dUniform
is indeed there to "irritate" or in other words to tell you it's not a normal uniform distribution.
returns a discrete number (hence the "d"). You can use Uniform
to get a non-discrete number.
If you want more information, you can place the cursor in the command and press the F1-button. This will open the help and the related topic, where additional information can be found.
I hope this helps you further!