Seven, Plus or Minus Two

The "Seven, Plus or Minus Two" rule refers to the idea that the number of objects an average human can hold in working memory is about seven, give or take two [1].

References

1. https://en.wikipedia.org/wiki/The_Magical_Number_Seven,_Plus_or_Minus_Two
2. https://en.wiktionary.org/wiki/two-pizza_rule