A number of ASL writing systems have emerged over the past decades: a few systems for linguists and a few systems for daily ASL writing. A digibet (equivalent to alphabet) of digits (equivalent to alphabetical letters) have been developed.
After learning two digibts of digits, I decided to further experiment with more ideas. While ASL writing is in the early stage, it's a good time to experiment and evolve.
In early 2015 (or December 2014), I tried to figure out how to resolve the "baby" handshapes for O, C, and D. It lead me to create the baby circle that can be recycled across the baby handshapes.
Along the same timeline as above, I experimented with the fist handshapes and came up with an interesting idea for T, N, M. The advantage of these written forms is that one can easily write a digit for a different form of N (half E). See the written half E (with no image of my hand) in the image below.
With the same time frame, I explored a group of "G", "D" and "1" as shown below. Some exist the same as ASLwrite and si5s. Some modified and added. I was particularly interested in the idea of using a thumb control in ASL writing (see the last two illustrations in the image below).
Experimenting with spatial reference in ASL writing
Introducing ASL writing. ASL Writing Dictionary