I'd like to ask what "nodded acknowledgement" means in the following context:
We had parted from (but were still in sight of) our delightful newfound friends when a solitary male figure coming down the slope caught our attention. “That looks like St. Germain,” said my friend; leaving me blank, since I had never seen his picture. The man clad in a simple light-purple robe stopped, smiled, and nodded acknowledgement, hands together.
Does it mean he nodded to show that he noticed them?