a unique item identifier means what?
If by 'head node' you simply mean the first node, then yes; but if 'head node' means the special element which is not supposed to ever be deleted (aka sentinel node), then no.
If you mean a variable name, then no -- it must begin with a letter or an underscore, but any combination of letters, digits and underscores may follow. If you mean a variable that stores an identifier, then yes -- so long as the identifier is a string type.
it's called the SSID (service set identifier)
Carrier
a unique item identifier means what?
An ISBN is a unique identifier for books, while a DOI is a unique identifier for digital documents and research articles.
Primary key
unique identifier
What unique identifier is required on any device that communicates with the Internet of Everything (IoE)?
the end user code
primary key
pancakes
Unique Item Identifier
The MC address
An IP address is the unique identifier assigned to any personal computer connected to the internet.
The best way to identify the make and model of a guitar using its unique guitar identifier is to search for the identifier on the manufacturer's website or contact the manufacturer directly for information.