Worthy is he who opens his mouth in three prayers, to receive
The ‘additional service’ (musaph) – this is the Righteous-One (Yesod), that includes all prayers. And it is in the additional prayer that they say: ‘A Crown (keter) they give to you Y”Y ELoQeYNU...’cxiLiturgical, Sabbath Additional Service (Spanish rite)
And the ‘crown’ is Higher Keter, Y”Y ELoQeYNU is Father and Mother, (Is. 6:3) Holy, holy, holy... – the three Patriarchs, Y”Y of Hosts – the covenant of circumcision, and the two ‘thighs of truth’☉Netzaḥ-Hod,... the Earth is full of His glory – this is the Shekhinah.