/usr/share/texlive/texmf-dist/tex/fontinst/smbletx/digit2.etx is in texlive-font-utils 2013.20140215-2.
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\encoding
% digit2.etx - This ETX file defines the \digit commands through
\setcommand\digit#1{#1/2}
% so that it will append a suffix /2 to the glyph name given.
% Use this with a "suffix /2" clause in \installfont to select
% digits from a different font that most of the glyphs.
\endencoding
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