SetterBar[x, {val_1, val_2, ...}] represents a setter bar with setting x and with setter buttons for values val_i.SetterBar[Dynamic[x], {val_1, val_2, ...}] takes the setting ...
HoldAllComplete is an attribute which specifies that all arguments to a function are not to be modified or looked at in any way in the process of evaluation.
HoldComplete[expr] shields expr completely from the standard Mathematica evaluation process, preventing even upvalues associated with expr from being used.
DiscreteLyapunovSolve[a, c] finds the numeric solution x of the discrete matrix equation a.x.a\[ConjugateTranspose] - x == c.DiscreteLyapunovSolve[a, b, c] solves a.x.b - x ...
NHoldAll is an attribute which specifies that none of the arguments to a function should be affected by N.
NHoldRest is an attribute which specifies that all but the first argument to a function should not be affected by N.
LyapunovSolve[a, c] finds a solution x of the matrix Lyapunov equation a.x + x.a\[ConjugateTranspose] == c.LyapunovSolve[a, b, c] solves a.x + x.b == c.LyapunovSolve[{a, d}, ...
HoldAll
(Built-in Mathematica Symbol) HoldAll is an attribute which specifies that all arguments to a function are to be maintained in an unevaluated form.
Bottom
(Built-in Mathematica Symbol) Bottom is a symbol that represents the bottom for purposes of alignment and positioning.
FeedbackType is an option for some control system functions that specifies the feedback type.