Control-V :w : how to write single character?

I wanted to write out an unclear character that my
cursor was over, so I tried to go into character VISUAL
selection mode by pressing Ctl-v, then ':w! /tmp/ch'.
Instead of the single character at the cursor, I got
the whole line. I also tried with a lower case 'v'.

When interactive, selecting with either 'v' or 'ctl-v'
and hitting 'y', then pasting it somewhere, only 1
character is selected.

How would I write out only the 1 character I had
selected?

thanks,
-linda

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