terminology - What do you call this input element where a focus will automatically be transferred to next text field after being filled?

I have seen this input element often when inputting a serial number or similar code. Each text field accepts N characters, after which focus is automatically transferred to the next field. Pressing backspace when there are no characters in a field moves focus to the previous field. In this way, the fields are segregated for easier reading but content flows for ease of use.

I apologize if this has been asked before, but it's hard to search for when I don't know what search term to use.

Answer

I have always known this as Auto Tab or (Auto tab input fields). As a matter of fact a search for Auto Tab gives me different ways of implementation of this element, including:

And even Microsoft dev calls it that way.