It is an asymmetric pentatonic scale, which is pleasing and has been more popular in last 50 years. It figures in ragamalikas, slokams, vrittams and light popular songs, as it is a pleasing scale.
The notes in this scale are chathushruthi rishabham, sadharana gandharam, prati madhyamam, chathusruthi dhaivatam in arohana and additional kakli nishadham in avarohanam, in place of sadharna rishabham (see pictures). From Dharmavati scale (59th melakarta), the panchamam is removed in this scale and the rest are used in asymmetrical manner which gives the pleasing aspect to this ragam.
S R2 G2 S, S N3. D2. S - is a catch phrase that is unique to ragam Ranjani (where N3. and D2. denotes lower octave).