Card, is this the same as being used in the sidhi programme, (inner light)? Looks like it is from its placement.
http://yogasutrastudy.info/yoga-sutra-translations/ysp-sutras3-21-3-40/ Sutra III.32 मूर्धज्योतिषि सिद्धदर्शनम्॥३२॥ mUrdhajyothiShi siddhadarshanam [HA]: (By Practicing Samyama) On The Coronal Light, Siddhas Can Be Seen. [IT]: (33): (By performing Samyama) on the light under the crown of the head vision of perfected Beings. [VH]: On the light on the top of the head vision of the perfected ones. [BM]: >From perfect discipline of the light in the head, one gets a vision of the >perfected beings. [SS]: (33): By samyama on the light at the crown of the head (sahasrara chakra), visions of masters and adepts are obtained. [SP]: (33) By making samyama on the radiance within the back of the head, one becomes able to see the celestial beings. [SV]: (33): On the light emanating from the top of the head sight of the Siddhas.
