Using numbers as part of Lilypond variable names

It is said that you cannot use numbers as part of Lilypond variable names. They are taken as durations.
Here are possibilties to do so, anyway.
Defining them in scheme or as a string.

\version "2.24"

%% Often I would like to use numbers in Lilypond variable names
%% for more clarity and a better overview.
%% Numbers are allowed as a part of variable names in Scheme, but not in Lilypond.
%% They would be taken as durations.

%% Here are possibilties to use numbers anyway

%% As Scheme variable: fill in your music between #{  and  #}
%% instead of backslash as prefix for reference
%% you use a dollar sign (not so bad at all ;-) )

%% With doublequotes: enclose your variablename with doublequotes and reference it
%% as usual with backslash

%% With newer versions a dotted syntax like: m.1 = ...
%% is possible, but may need some further development.

\paper { tagline = ##f }

#(define part1 #{ \relative c'' { a^\markup { This is part1 (defined as scheme variable) } e f e8 e } #} )
"part2" = \relative c'' { g_\markup { This is part2 (defined with doublequotes) } c d c8 c }

\markup 
  \column {
    "The first piece of music is named part1, the second \"part2\""
    \vspace #1
  }

\score {
  <<
    \new Staff $part1
    \new Staff \"part2"
  >>
}

\score {
 \new Staff %% you can omit \new Staff in newer Lilypond Versions
  {
    $part1
    \bar "||"
    \"part2"
  }
}