Tool Clamping Systems

Regarding the HSK system:
I see this is described having "positive taper lock". What does the "positive"
bit refer to? ...And does a "negative" taper lock system exist??
Have a good weekend R.
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Rob wrote:

The shanks on HSK tooling are designed to expand when clamped as well as being drawn up against the spindle nose hence creating a positive lock.
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