Crossword clues for the word: FTLB The word FTLB has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for FTLB Showing 1 to 7 of 7 results Clue(s) Eng. unit whose SI counterpart is the joule Unit of energy: Abbr Unit of work: Abbr. Unit slightly larger than a joule: abbr. Work meas. Work unit in the Eng. system Work unit: Abbr.