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. 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 )…..
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 
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.