Also the Hebrew word for "One" in the SHAMA is "echad" which means "unity, altogether, togetherness". It likewise suggests a unity of several elements acting as one going one way or the other.
Thus the Hebrew SHAMA which reads thus: "Hear O Israel, the Lord [YHWH] our God [Elohiym] is one [echad] Lord"[Deut 6:4] actually testifies to the unity in plurality or plurality in unity of the God of Israel.
As far as the Triune nature of the God of Israel, Isaiah records: "I have not spoken in secret from the beginning, from the time it was there am I [Jesus], and now the Lord God [the Father] and His Spirit [the Holy Spirit] hath sent me." [Isaiah 48:16]
Isaiah again records: "The Spirit [Holy Spirit] of the Lord God [the Father] is upon me [Jesus]...". [Isaiah 61:1]
Also an interesting note: The primary root words of the Hebrew language are triune consonants: "malak, yadah, zarach, hadar......" --- three separate consonants [or letters]acting together to create a singular meaning: a trinitarian unity, so to speak. Thus the very character of the Hebrew words themselves testify to the "triune" nature of the God to Israel.
Deu 6:4 Hear, O Israel: The LORD our God [is] one LORD:
You say God is a plurality based on a name, yet the OT clearly states that despite implications of plurality, God is one.
Gal 3:20 Now a mediator is not [a mediator] of one, but God is one.
Even the New Teatament clearly states that God is one, not a plurality.
Niiiiiice.
Word games using Elohim and Echad found here:
http://www.torahofmessiah.com/elohim.html