learning sign (Pali: uggaha-nimitta)
A subtler object that replaces the preliminary sign when the meditator sees the mental image of something—a kasiṇa, for example—as clearly with closed eyes as with open eyes looking at it.
A subtler object that replaces the preliminary sign when the meditator sees the mental image of something—a kasiṇa, for example—as clearly with closed eyes as with open eyes looking at it.