Number variable <var> is either assigned value <number> with "=" clause, or it is assigned 0 if equal clause ("=") is omitted.
If "process-scope" clause is used, then number is of process scope, meaning its value will persist from one request to another for the life of the process.
Examples
Initialize number "my_num" to 0 and the value of this variable, however it changes, will persist through any number of requests in the same process: