What is it?

[Thinker]

There are various definitions...

Oracle:
1)Back in ancient times, an oracle was someone who offered advice or a prophecy thought to have come directly from a divine source. In modern usage, any good source of information can be called an oracle.

2) (biblically:) Oracle [N]
In the Old Testament used in every case, except 2 Samuel 16:23 , to denote the most holy place in the temple ( 1 Kings 6:5 1 Kings 6:19-23 ; 8:6 ). In 2 Samuel 16:23 it means the Word of God. A man inquired "at the oracle of God" by means of the Urim and Thummim in the breastplate on the high priest's ephod. In the New Testament it is used only in the plural, and always denotes the Word of God ( Romans 3:2 ; Hebrews 5:12 , etc.). The Scriptures are called "living oracles" (Compare Hebrews 4:12 ) because of their quickening power ( Acts 7:38 ).

I believe that no person should try to get between another and God. Yet, I also believe that we tend to learn most from one another. I’d say that symbols (including letters/words) can be oracles as scripture suggests.

[Kingdom of ZION]

What is an Oracle?

I think what your asking is what did Joseph Smith think were Oracles?

2 Therefore, thou art blessed from henceforth that bear the keys of the kingdom given unto you; which kingdom is coming forth for the last time.
3 Verily I say unto you, the keys of this kingdom shall never be taken from you, while thou art in the world, neither in the world to come;
4 Nevertheless, through you shall the oracles be given to another, yea, even unto the church.
5 And all they who receive the oracles of God, let them beware how they hold them lest they are accounted as a light thing, and are brought under condemnation thereby, and stumble and fall when the storms descend, and the winds blow, and the rains descend, and beat upon their house.
[D&C 90:1-5]

39 Therefore, verily I say unto you, that your anointings, and your washings, and your baptisms for the dead, and your solemn assemblies, and your memorials for your sacrifices by the sons of Levi, and for your oracles in your most holy places wherein you receive conversations, and your statutes and judgments, for the beginning of the revelations and foundation of Zion, and for the glory, honor, and endowment of all her municipals, are ordained by the ordinance of my holy house, which my people are always commanded to build unto my holy name. ...
125 I give unto you my servant Joseph to be a presiding elder over all my church, to be a translator, a revelator, a seer, and prophet.
126 I give unto him for counselors my servant Sidney Rigdon and my servant William Law, that these may constitute a quorum and First Presidency, to receive the oracles for the whole church.
[D&C124:39, 125-126]

I think it is clear, the Oracles are Revelations!