A schist plaque

HS scribe unknown

A.  a.ma

1. a.ma | 天 (ama) | heaven, sky; deva

Notes:  Thus far, this plaque is the only LinA inscription from this site.  Compare 天照大  神 Amaterasu Oomikami “the sun goddess”, which is the principle deity in the Shinto pantheon.  照らす terasu means “to illuminate, to shine”, and 大御神  oomikami, or ookami, is an archaic term that  means “god, goddess”; thus, perhaps, “shining-heaven  goddess”.