It is an indicator used in charts of financial analysis of stocks, commodities, currencies...

There is an indicator called Moving Average and it is divided into two types;

SMA (Simple Moving Average)
المتوسط المتحرك البسيط

EMA (Exponential Moving Average)
المتوسط المتحرك السريع

Weighted Average is:

المعدل المرجح

When adding "Exponentially" we obtain:

المعدل المرجح السريع

an average in which more value is given to some things than others depending on their importance:

The index is a weighted average of growth rates in corporate earnings, consumer spending, and personal income.