It's a kind of Pivot Point.
R4 = C + ((H-L) x 1.5000)
R3 = C + ((H-L) x 1.2500)
R2 = C + ((H-L) x 1.1666)
R1 = C + ((H-L) x 1.0833)
PP = (H + L + C) / 3
S1 = C – ((H-L) x 1.0833)
S2 = C – ((H-L) x 1.1666)
S3 = C – ((H-L) x 1.2500)
S4 = C – ((H-L) x 1.5000)
C – Closing Price, H – High, L – Low
More emphasis is given to the closing price as opposed to the pivot point.
Status:: #wiki/notes/mature
Plantations:: Technical Indicators - 20230221104502
References:: Babypips