Tenchi Muyo! -- Enclycopedia Tenchicca -- Emblem of Power

From the pages of Wasyu's Encyclopedia Tenchicca--

Emblem of Power (OVA)

n.: Unlike the cosmetic markings found on many Juraian royalties, the dual-triangular shaped emblem on Sasami's forehead is real. Sasami received this emblem after her assimilation with Tsunami, who owns a similar emblem (a pair of circles as opposed to triangles). The Emblem of Power glows when Sasami accesses Tsunami's power or envisions Tsunami's Dream.

You must set the /tmp/ad_network_ads.txt file to be writable (check file name as well).