At Standard Ebooks we use the three-em-dash to indicate a fully obscured word, for example this line from Tristram Shandy:

> He lies buried in the corner of his churchyard, in the parish of ⸻, under a plain marble slab

If we were to use three em dashes in a row, the renderer typically puts a 1-2px gap between them. Using U+2E3B leaves no gaps.

Likewise, we use a 2-em dash, U+2E3A, for partially obscured words, for example this line from Gogol's short fiction:

> The town of B⸺ had become very lively since a cavalry regiment had taken up its quarters in it.