osifont (ISO 3098 lettering for CAD drawings)
https://github.com/hikikomori82/osifont

The file osifont-lgpl3fe.woff is the upstream "osifont-lgpl3fe" build, copied
unchanged from the project repository. Upstream offers the font under three
licences; this site uses it under:

  GNU Lesser General Public License, version 3 (LGPL-3.0-osifont.txt),
  which incorporates the GNU General Public License, version 3
  (GPL-3.0-osifont.txt), with the GPL font exception below.

Font exception:

  As a special exception, if you create a document which uses this font, and
  embed this font or unaltered portions of this font into the document, this
  font does not by itself cause the resulting document to be covered by the
  GNU General Public License. This exception does not however invalidate any
  other reasons why the document might be covered by the GNU General Public
  License. If you modify this font, you may extend this exception to your
  version of the font, but you are not obligated to do so. If you do not wish
  to do so, delete this exception statement from your version.

Source: the .sfd sources are in the upstream repository above.