Looks like hand lettering.
If you used a font, you could achieve a similar effect by:
- distorting / scaling letters
- overlaying them so that they connect
- Boolean union
There’s a bit of a discussion of some of that sort of thing in: Could use some guidance on creating a carve
and be sure to see: http://docs.carbide3d.com/assembly/carbidecreate/video-tutorials/#boolean-operations