Is a byte, a collection of 8 bits, considered to be a datum or data? 

I would assume a bit would unequivocally be considered a datum, but I've seen an individual integer referred to as a datum too. Given that integers are often implemented as collections of 32 bits in most programming languages, would that mean that an arbitrarily large collection of bits could be considered a datum? 

If a collection of multiple bits can be considered a single datum, at what point does a datum become so large it can be considered data?

For context, I was writing a class to hold an arbitrarily sized number, and I was trying to decide if I should call a list that had a variable number of bits "Data" or "Datum".