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.
Be patient therefore, brethren, until the coming of the Lord. Behold, the husbandman waiteth for the precious fruit of the earth: patiently bearing till he receive the early and latter rain.
Behold, we account them blessed who have endured. You have heard of the patience of Job, and you have seen the end of the Lord, that the Lord is merciful and compassionate.