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Spam?

If you had answered the call or they had left a message, you should already know.
"Spam" is a term for either:
1) A processed meat product usually sold in small metal containers.
2) An unwanted message (usually advertisements) sent via email, fax, phone calls and texts.
Spam does not necessarily equate to Scam.

Since it rang your phone, we can eliminate option 1.
It was not a robocall, since a prerecorded message was not left as a voice mail.
If you had answered there might have been a spammy message that would have been spoken/played only after confirming a person was on your end of the call.  But we may never know that.
Most likely this should be classified as a "Missed Call" (rather then option 2) as there are non-spam types of callers (Surveys, Debt Collectors, Misdials by rude people who will not leave a simple "Sorry for bothering you." message, etc.) that do not leave messages.

In any case, why worry about it?  Someone (that you obviously do not know) rang you phone, you did not or could not answer, and they did not think it was important enough to leave a message about why they called.  Nothing to worry about or lose sleep over, more something to just ignore.  If it bothers you enough, just block the number.