On several of the modules, there are 2 boxes with symbols in them. I can't find what they mean anywhere. Tokens on the "!" represent cost modifiers, see the rule book (Almanac) page 35.
The symbols are: >> and !
What do they stand for?
Some Malfunction cards instruct you to put tokens on specific ">>" or "!" spaces.
The penalty triggered by a red cube in the "gears" status marker on the "Working Bay" puts a token on the "!" space (Almanac, pages 28 and 29).
Adventures are triggered by taking action that has a "?" token on its "!" space
Finally, during Clean-up phase, tokens on the "!" space are discarded and the topmost token on the ">>" space moves to the "!" (page 60).