One of the authors of the Frictionless Data specifications here. The spec directly relevant to CSV is Table Schema [1], and we’ve also got some nice tools that leverage Table Schema and the family of specifications, such as goodtables [2].
This looks interesting and useful. It might be a feature that wouldn't get used a lot but I've always felt that it would be great to have a 'unit' field to specify the physical units of the values. Have you ever discussed adding this as an optional field to the specification?