Definitions for "High water mark"
In the context of serial communications, when this point is passed in a receive buffer, a flow control suspend event is triggered. See also: XOFF
Highest level of a waterway at normal rise.
A reference mark on a structure or natural object, indicating the maximum stage of TIDE or flood.
(Real Application Clusters Concepts; search in this book) [definition #2] (Real Application Clusters Deployment and Performance; search in this book)