Assigned for inventory and sampling purposes. Log number: each log is assigned a separate number. Flitch number: half a log is given a separate number. Section number: sometimes different sections are numbered by adding a dash and another number to the log or flitch number to show it came from the same tree. Bundle number: number given to a specific number of sheets that are tied together.
Usually done offline, the process by which collated sheets are consecutively numbered, e.g. for order books.
In computability theory a numbering is the assignment of natural numbers to a set of objects like rational numbers, graphs or words in some language. A numbering can be used to transfer the computability concept, which is strictly defined on the natural numbers using computable functions, to different objects.