I am relatively new to Lingustics.SE. I have no formal knowledge in Linguistics and I am unsure if this question is better suited for History.SE or here.
Recently, I was reading about the Old Tamil script and there seems to be quite a dramatic shift in the time period of 3rd to 5th AD. Also, there seems to be a lot of missing letters too.
- Is there some kind of reason for this shift?
- Is there some reason for the absence of these letters? (Like have they just not been discovered or is there some kind of issue?)
Link to the script: