Face, presence, countenance; the Angel of His Presence.
In Isaiah 63:9, the 'angel of his presence' (malak panav) saved Israel. Panim means face or presence. Exodus 33:14-15 has God saying 'My presence (panim) shall go with thee,' which some connect to the Angel who led Israel through the wilderness. The concept of God's 'face' or 'presence' going with Israel as a distinct figure who is yet God himself is the theological core of the Christophany argument.