ButtonBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for cells that specifies settings for buttons within the cell.
General
(Built-in Mathematica Symbol) General is a symbol to which general system messages are attached.
ImageSizeMultipliers is an option that specifies how much smaller to render graphics that appear within other constructs.
RevolutionAxis is an option for RevolutionPlot3D which specifies the revolution axis around which the curve should be rotated.
Unevaluated[expr] represents the unevaluated form of expr when it appears as the argument to a function.
Here is a homogeneous equation in which the total degree of both the numerator and the denominator of the right-hand side is 2. The two parts of the solution list give ...
You can tell a lot about what "type" of expression something is by looking at its head. Thus, for example, an integer has head Integer, while a list has head List. In a ...
mcomplex*MTensor_getComplexData (MTensor t) gets an array of the data elements of an MTensor of complex type.
mint const*MTensor_getDimensions (MTensor t) gets an array of the dimensions of an MTensor.
mint*MTensor_getIntegerData (MTensor t) gets an array of the data elements of an MTensor of integer type.