'Olive trees' in the Bible

and, Two Olive-trees, by it, - one upon the right hand of the bowl, and one upon the left hand thereof.

Then responded I, and said unto him, - What are these two olive-trees, upon the right of the lampstand, and upon the left thereof?

And I responded a second time, and said unto him, - What are the two branches of the olive- trees which join the two golden tubes, which empty out of them the golden oil?