The Angel Gabriel Appears To Interpret the Vision.
‘And so it was that when I, even I Daniel, had seen the vision, that I sought to understand it, and behold there stood before me the appearance of a man, and I heard a man's voice between the banks of the Ulai which called and said, “Gabriel, make this man (or ‘that one there' - hallaz) to understand the vision.'
Daniel, considering the vision he had seen and seeking in his own mind to understand it, suddenly saw the appearance of a man (gaber = ‘man' or ‘strong' - suggestive of Gabriel = ‘man of God' or ‘God has made strong') before him. Then he heard the voice of a man (adam), possibly coming from above the water at the centre of the river (compare Daniel 12:6-7), telling Gabriel (see also Daniel 9:21) to reveal to him the truth about the vision. It was the voice of authority.
The voice was probably not an ordinary ‘holy one' (angel) otherwise why differ from Daniel 8:13? Thus this must have been the man clothed with linen (Daniel 12:6-7; Ezekiel 9:2), who was so powerful that he could declare the ending of time (Daniel 12:7) and mark men off for judgment (Ezekiel 9:2), for the fact that it is described as the voice of a man suggests that whoever it was had appeared in human form. The voice commanded Gabriel to reveal the meaning of the vision.
We should note that, along with Michael the archangel, Gabriel is the only angel ever mentioned by name in Scripture (Daniel 9:21; Daniel 10:13; Daniel 10:21; Daniel 12:1; Luke 1:19; Luke 1:26; Jude 1:9).