Nothing. Terry is not a mathematical term. However "Tera" is a unit prefix in the metric system (e.g. 3.3 Tg) which indicates the number is multiplied by 1012 or 1000 000 000 000. It us indicated by the symbol T
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The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.