The term given to the pulse itself as the charge pump signal is a bit of a misnomer as it all depends on how the pulse is detected.
The most common term originally applied to detecting system failure in processor based systems was 'Watchdog timer' and still is in such systems as processor based motion cards, whether PC based or not.
This operates on the same principle as the charge pump, they differ in the way the pulse loss is detected.
Both methods can be used with the Mach signal, for example either a watchdog timer, which operates on the principle of the pulses repeatedly resetting a timer with a duration slightly longer than the pulse signal or a charge pump which relies on capacitive charge by the pulses.
Both methods originally came under the common term of Watchdog timer.
Traditionally this safety feature is/was commonly inserted in the E-stop string to detect any failure, start up, or shut down of the processor and shut the system down.
Hence "Watch Dog"