Is it Unique

[caradoc]

I am curious to know whether signal numbers are unique. For killing a process we have a command named as kill which has parameters used in it as process id and signal number. Does this mean signal numbers are unique? If more details are provided on this topic it would help all the members reading this thread.

[norman]

Each signal is identified by a name and a number. The signal numbers are not generally standard and normally vary from one system to another. If in the kill command the signal number is given as zero then the kill command goes for checking the validity of the specified process id.