Vijnana Bhairava Tantra

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धामान्तः क्षोभसम्भूतसूक्ष्माग्नितिलकाकृतिम् । बिन्दु शिखान्ते हृदये लयान्ते ध्यायतो लयः ॥ ३७ ॥

sanskrit

Whenever one meditates upon the subtle lire, in the form of a tilak (like the mark on the forehead), or on the bindu at the end of the shikha, a condition of agitation and shaking is produced, followed by absorption and dissolution in the cave of the heart.

english translation

dhAmAntaH kSobhasambhUtasUkSmAgnitilakAkRtim | bindu zikhAnte hRdaye layAnte dhyAyato layaH || 37 ||

hk transliteration by Sanscript