It is an Inji created by Inji craftsman 00 (Double O).
Two RCIs will be displayed, and when they reach a certain value and then cross, an entry sign (arrow) and an exit sign (hand mark) will appear.
In the default setting, a short sign will be given if two RCIs advance to 0.7 or more and then cross, and a long sign will be given if two RCIs advance to -0.7 or less and then cross.
Also, for exits, a sign will be given if the two RCIs advance to 0.6 or more and then cross, or if they advance to -0.6 or less and then cross.
It's a bit unusual to bring the concept of cross to RCI.
However, it is an effective signal indicator due to the restriction that it will give a sign when it crosses after reaching a certain value.
If you are using RCI, it will be interesting to try it.
Do not show pity: life for life, eye for eye, tooth for tooth, hand for hand, and foot for foot.
Deuteronomy 19:21