What "NP" and progress bar nearby means?

[Steve_Hammatt (Steve)]

Zwiftpower Acronyms and Icons

>>  I think NP is normalised power but I am not sure of the significance of the colour.  correct, NP is normalized power.  the various colours indicate the Variability Index.  You can see this if you hover the mouse pointer over the NP bar. The VI is the normalized power divided by average power…