Ksp reference Manual

Knob Unit Mark Constants
To be used with 
set_knob_unit()
.
$KNOB_UNIT_NONE
$KNOB_UNIT_DB
$KNOB_UNIT_HZ
$KNOB_UNIT_PERCENT
$KNOB_UNIT_MS
$KNOB_UNIT_ST
$KNOB_UNIT_OCT
$NI_SIGNAL_TYPE
Can be used in the 
on listener
callback to determine which signal type triggered the callback.
Built-in Variables and Constants
163
KSP Reference Manual

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17.5. Mathemetical Constants
~NI_MATH_PI
Returns the mathematical constant pi (approx. 3.14159…)
~NI_MATH_E
Returns the mathematical constant e (approx. 2.71828…)
Built-in Variables and Constants
164
KSP Reference Manual

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18. CONTROL PARAMETER VARIABLES
18.1. General
$CONTROL_PAR_NONE
Nothing will be applied to the control
$CONTROL_PAR_HELP
Sets the help text which is displayed in the info pane when hovering the control
$CONTROL_PAR_PARENT_PANEL
Places a control to a panel. The value should be the UI ID of the panel