The documentation for ancient time signatures
http://lilypond.org/doc/v2.11/Documentation/user/lilypond/Ancient-time-signatures
(it doesn't seem to have changed noticeably since 2.10, which is what
I'm actually using) has a circle with a dot inside and a left half circle
with a dot inside, but no
If you look at the Appendix The Feta font in the manual, you will find
symbols called timesig.mensural68alt and timesig.neomensural68alt that
look like what you describe (if I get you right). I couldn't find any easier
way of using these symbols than
\override Staff.TimeSignature #'stencil =
Laura Conrad lconrad at laymusic.org writes:
The documentation for ancient time signatures
http://lilypond.org/doc/v2.11/Documentation/user/lilypond/Ancient-time-signatures
(it doesn't seem to have changed noticeably since 2.10, which is what
I'm actually using) has a circle with a dot