It means you replied to the message that the person sent you. A dark green arrow means you forwarded the e-mail and a red arrow mean you forwarded twice or more.
Do you mean to refer to the Order of the Arrow?
The green arrow is what is often known as a "filter." This means vehicles are permitted to proceed with caution in the direction indicated by the arrow.
A green arrow showing same time as a red light proceed carefully in the direction of the arrow after yielding the right-of-way to other vehicles and perdestrians
the blue arrow means its a boy and the red arrow means its a girl.
This means you cannot turn. If you are in a turning lane and you see a red arrow you must wait till it is green before advancing.
It means stop first then can proceed if clear
In the U.S., a Red light always means stop. If the red arrow is to the right, you may turn after stopping if it is clear. In many states you may turn left on a red arrow after stopping if turning onto a one way street.Check your local jurisdiction for traffic rules on red arrows.The new national standard prohibits turning on red at a red right arrow.The red arrow is like the circular red, except that it applies to only the traffic making that turn.
The green arrow is what is often known as a "filter." This means vehicles are permitted to proceed with caution in the direction indicated by the arrow.
Add engine coolant
It means stop first then can proceed if clear
They are not red arrow planes. They are BAE Systems Hawks.