The Sanskrit word chin means ‘consciousness’; therefore this hand position can be translated as the ‘attitude of consciousness’.
This mudra is very similar to jnana mudra. Again the tip of the index finger can be either placed at the root of the thumb or so that the tip of the index finger is in contact with the tip of the thumb.
The difference lies in the arrangement of the hands on the knees. During chin mudra the hands are placed so that the palms face upwards with the backs of the hands resting on the knees. The unbent fingers should also point forwards away from the body. The symbolic meaning is the same as jnana mudra.