MaxSteps is an option to functions like NDSolve that specifies the maximum number of steps to take in generating a result.
Modulus
(Built-in Mathematica Symbol) Modulus -> n is an option that can be given in certain algebraic functions to specify that integers should be treated modulo n.
O
(Built-in Mathematica Symbol) O[x]^n represents a term of order x^n. O[x]^n is generated to represent omitted higher-order terms in power series. O[x, x_0]^n represents a term of order (x - x_0) n.
Parallelization is an option for Compile that specifies whether it should create a compiled function that could run in parallel.
Prime
(Built-in Mathematica Symbol) Prime[n] gives the n\[Null]^th prime number.
ProgressIndicator[x] represents a progress indicator with setting x in the range 0 to 1. ProgressIndicator[Dynamic[x]] takes the setting to be the dynamically updated current ...
Quartics is an option for functions that involve solving algebraic equations that specifies whether explicit forms for solutions to quartic equations should be given.
RadioButton[x, val] represents a radio button whose setting x is set to val when the button is clicked. RadioButton[x, val] is displayed as RadioButtonBox[0, {0}] when x is ...
RamanujanTauL[s] gives the Ramanujan tau Dirichlet L-function L(s).
Regularization is an option for Sum and Product that specifies what type of regularization to use.