The FIX protocols (financial interchange) make use of stop bit encoding.
I have heard of other places using this also. This is modern, current, non-legacy usage.
This is the length encoding where the most-significant bit of a byte is used to determine whether there are more ASCII characters or not. The last byte will have the most-significant bit of 1, prior bytes most-significant bit of 0. Minimum length in this length kind is 1.