(eplain.info)\csn and \ece

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7.6.1 '\csn' and '\ece'
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'\csn'{NAME} simply abbreviates '\csname' NAME '\endcsname', thus saving
some typing. The extra level of expansion does take some time, though,
so I don't recommend it for an inner loop.

   '\ece'{TOKEN}{NAME} abbreviates

     \expandafter TOKEN \csname NAME \endcsname

For example,

     \def\fontabbrevdef#1#2{\ece\def{@#1font}{#2}}
     \fontabbrevdef{normal}{ptmr}

defines a control sequence '\@normalfont' to expand to 'ptmr'.