to your document preamble or your LaTeX style file.
Actually, I don't know if the \nopagebreak is sufficient to
prevent a page break (see ticket #1255990), that needs testing.
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xindy example input
xindy example style
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user_id=70318
Workaround: Use
(markup-letter-group :open-head "~n\letterGroup{Numerals}{"
:close-head "}~n"
:group "default")
(markup-letter-group :open-head "~n\letterGroup{"
:close-head "}{}~n")
in the xindy style file; exchange `Numerals' in the first
line with the section header text that you want to have.
You need to add
\newcommand\letterGroup[2]{%
\par
\textbf{#1}%
\par\nopagebreak
}
to your document preamble or your LaTeX style file.
Actually, I don't know if the \nopagebreak is sufficient to
prevent a page break (see ticket #1255990), that needs testing.
I'd say "Symbols" is the most common header used for this (see also TLC2)