Span, memory
The number of items, usually words or numbers, that a person can retain and recall.
Memory span is a test of working memory (short-term memory).
In a typical test of memory span, an examiner reads a list of random numbers aloud at about the rate of one number per second.
At the end of a sequence, the person being tested is asked to recall the items in order.
The average span for normal adults is 7