OT: Japanese spirit writing

I've been trying to remember the name of this for weeks now, and I
cannot.  Web searches have not been helpful, either.

When I was in college, oh those many years ago, at the University of
Texas (Austin), I accidentally came across a survey of writing systems
in Japan.  In Japanese.  One of the syllabaries given was apparently
used by "spirits" or something like that.  It's a very sqiggly writing
system, but at the time I thought it looked pretty cool.

Has anyone else heard of this, or am I hallucinating?  Can anyone give
a name for this?

--
William Annis  -  System Administrator -  Biomedical Computing Group
"When men are inhuman, take care not to feel towards them as they do
towards other humans."                       Marcus Aurelius  VII.65