Help:Double underscore

In many of the Mahatma Letters, the writer has drawn a double underscore for emphasis. Special coding is necessary to add similar emphasis to transcriptions of letters:

<u><span style="border-bottom: 1px double #000;">This phrase will have a double underscore.</span></u>

This result will be:

This phrase will have a double underscore.

As a contrast, this is the same phrase with a single underscore, achieved by using and tags.

This phrase will have a single underscore.