A similar event happened to Isaiah 6:
6 Then one of the seraphim flew to me with a live coal in his hand, which he had taken with tongs from the altar. 7 With it he touched my mouth and said, “See, this has touched your lips; your guilt is taken away and your sin atoned for.”
8Then I heard the voice of the Lord saying, “Whom shall I send? And who will go for us?”
And I said, “Here am I. Send me!”
God commissioned Jeremiah to be a prophet to the nations. As such, he needed to speak, Chapter 1:
6“Ah, Lord GOD,” I said, “I surely do not know how to speak, for I am only a child!”
7But the LORD told me:
“Do not say,
‘I am only a child.’
For to everyone I send you,
you must go,
and all that I command you,
you must speak.
8Do not be afraid of them,
for I am with you to deliver you,”
declares the LORD.
9Then the LORD reached out His hand, touched my mouth, and said to me:
“Behold, I have put My words
in your mouth.
There is no doubt of the symbolic significance of God touching Jeremiah's mouth: God appointed him or commissioned him to speak for God. The event was real to Jeremiah in the spiritual reality. Jeremiah actually experienced the hand of God touching his mouth in a vision.
What was the hand of the Lord that touched Jeremiah's mouth? Was it physical?
No. It didn't take place in the horizontal/physical dimension but in the verticle/spiritual dimension.