Fonts saved as vectors in SVG format can be used for creation of OpenType fonts (*.otf) with some of the more advanced font editor or converters like the FreeFontConverter software.
Found 2 different conversion types using the same filename extensions.
Conversion svg to otf type 1:
Convert from XML based scalable vector graphics format to OpenType font file format.
On-line services software - convert svg to otf on web
A free web service for font conversion
File type (from-> to)
Convert from svg file format
XML based scalable vector graphics format
OpenType font file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned svg to otf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A tool for online conversion of fonts
Conversion svg to otf type 2:
Convert from SVG fonts format to OpenType font file format.
Apple macOS / Mac OS X software - convert svg to otf on OS X
A tool for creating new fonts