{stackengine} is for questions that do or might conceivably make use of the stackengine package
stackengine is for questions that do or might conceivably make use of the stackengine package. The stackengine package is useful for stacking objects vertically on top of each other.
A key command from this package is \stackengine, which takes 8 compulsory arguments. A short description of each argument is provided below; for more information, read the package documentation.
\SStackgap,LStackgap,\stackgapor<stacklength>- inter-item gap<anchor>- 'Bottom object' /<item>is stacked on<anchor><item>- Object to be stackedOorU- Overstack or Understack\stackalignment,l,corr- self-explanatory, default is center alignment\quietstack,TorF- determines if result of the stacking operation is suppressed from the output, default being false (not suppressed)\useanchorwidth,TorF- stack width to take width of anchor or that of the widest element in the stack\stacktype,SorL- short stack or long stack
E.g. of use can be seen here.