/usr/share/groff/1.22.2/font/devps/generate/dingbats.rmap is in groff-base 1.22.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #
# Predefined groff symbols for the reversed dingbats font.
#
a12 lh
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