Thus â ( A ) stands for Brahman, the Unknown…

◊       î ( [ ) is ‘this’ continuity at hand . It is the î+swar ( [|+svar ) or the īśwara, the God that is manifest and pratyakśa or lies within the realm of our senses. It is the Aleph 1, א₁ – the continuous infinity of Cantor’s theory of Infinities[25]. It is uncountable, as rigorously proved in the reference, and from this emerges the countable infinity again and again without diminishing it.

idam( [dma\ ) is linked to Lord Indra , after whom our senses are named indriyān. (Indra appears in Rig Veda and is synonymous with the later concept of Īshwara , this is explained by S.Radhakrishnan[26] )…..

sa etameva purusambrahm tatmam+apaśyat. idamadarśam itīm.
tasmāt idamdro ha vai nām. tamidamindra santam+indra ityācakśate
prokśain . prokś+priyā iva hi devāh , prokś+priyā iva hi devāh .

Aitareya Ārānyaka II.4.3 & Aitareya Upaniśad I.3.14 [27]

 He saw this purusa (the first born), as the constituent of the Brahman, over-spreading all. With wonder he said, idamadarśam – “Oh ! I have seen this.” Therefore He is called idamdra (idam+dra). Idamdram, verily is His name. Though He is indirectly called Indra. The Devas or Gods are fond of the cryptic ; the Gods are indeed fond of being called indirectly.