In Thailand, the 12,26 Cross over is well known as the CDC-ACTION ZONE indicator.
The definition of a in this indicator is when the fast crosses up the slow .
The definition of a is when the fast crosses down the slow .
When fast is over slow the column will show in a green column and when fast is below slow the column will show in a red column.
I have made this indicator for use with CDC-ACTION ZONE.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.