With "LANG=C.UTF-8", "man size" writes U+23AA (CURLY BRACKET EXTENSION) characters in place of vertical bars (ASCII 0x7C). Not only does this Unicode "Miscellaneous Technical" character not display properly, it also seems a poor character choice for this context.
Possibly not related, after several attempts in a row, sometimes up to ten, I see the following error: $ man size | head SIZE(1) GNU Development Tools SIZE(1) NAME size - list section sizes and total size. SYNOPSIS size [-A⎪-B⎪--format=compatibility] [--help] Error executing formatting or display command. System command (cd "/usr/share/man" && (echo ".pl 11i"; /usr/bin/gunzip -c '/usr/share/man/man1/size.1.gz') | /usr/bin/tbl | /usr/bin/nroff -c -mandoc 2>/dev/null | /usr/bin/less -isrR) exited with status 36096. No manual entry for size $ --Ken Nellis