Numeric constants can optionally be expressed as a power of 10, e.g. "1E7" rather than "1000000".
The constants True and False are built in and can be used anywhere as substitutes for 1 and 0 respectively.
The constant nan is built in and can be used to force a formula result to be nan (not a common need).
Most Strategy Elements are defined by Formula Syntax, but many are defined by constants that represent the selected choice for that setting. See Strategy Element Value Types and Defaults for details.
