Token of the covenant
In Genesis 9:12, this signifies a sign of the presence of the Lord in charity. (Arcana Coelestia 1038)
Arcana Coelestia #1039
1039. 'Which I give between Me and you' means conjunction of the Lord with man by means of charity. This is clear from what has just been stated about the covenant and the sign of the covenant. Actually 'the covenant' is the Lord's presence within charity, 'between Me and you' is conjunction resulting from that presence, 'giving' is bringing it about.