Blast calls this metric, Bat Speed. I call it Bat Velocity and Bat Velo for short. I feel it is more consistent with other metrics in that Bat Velo is measured based on Miles Per Hour (MPH). Other metrics, such as pitch velo, Exit Velo are also measured in MPH.
So, Bat Velocity is how fast, in MPH, the bat is moving at the point of contact and we use Blast Technology for this testing.
Bat velocity can be a pretty good indicator of potential Power where the higher the velocity the more potential power the hitter will possess.
You will need to be a NFA Member to view the Bat Velocity Metrics. We do this since names are used for the metrics. It is free.