Meaning of the number in 'Endurance 4.0'

Relative new to TR so apologize for the dumb question. I see workouts are labeled like ‘Endurance 4.0’, ‘Threshold 5.0’…What do those numbers mean? Must have missed that somewhere.

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Great post above, but make sure to check out the entire category for AT, that covers a bunch more worthwhile info:
https://support.trainerroad.com/hc/en-us/sections/360012393052-Adaptive-Training

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