How total volume indicator $TVOLI is calculated?

External question — Personal Finance Stack Exchange Author: huab Original post: https://money.stackexchange.com/questions/144746 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. The value of dow jones industrial average total volume indicator "$TVOLI" is just about 50,000 , while there are millions of shares traded each day in these 30 stocks. How is this indicator calculated and in which unit its value ?