Pound-mass or pound (LBS) has been derived from a Roman word libra. It is represented by Ib or Ibs.
Derive. Obtain something from (a specified source). Obtain, get, take, acquire, extract, attain. Base a concept on an extension or modification of (another concept).
To get something from something else. Coming from a source or origin. To take, receive, or obtain especially.
The following is the general idea derived from these researches. “In other respects his book is derived almost entirely from Christie”.