When user name is a number, what is the correct name for label

Question

When user name is a number, what is the correct name for label?

When we use an email + password to login, the label can be named USERNAME or EMAIL.

But in my case, the username is a number - actually the id of employee in the company, something like 856974.

I think "user name" is not correct to label.

Suggestions?

Answer 1

User ID

Employee ID

ID

Account ID

Something like that

Answer 2

Either User number (Something along the lines of Social Security number, or Roll Number)

or User Id (something along the lines of Employee Id)

I am assuming that the question is in the context of a registration form, not profile view