I am happy to announce the launch of the Mathematical Notation Census,
a web-based recollection hosted by the Math-Bridge EU project.
The intent of this census is to collect the mathematical notations in
wide use around the world in a pictorial form with precise references
to existing works.
http://wiki.math-bridge.org/display/ntns
This project is a wiki intended to attract contributions from around
the world.
A notation is generally just an "observation": name a culture, provide
a picture, name the source.
You are welcome to register, comment, suggest further source of widely
used mathematical texts...
Paul Libbrecht