Console applications and windowed applications* use different encodings, often cp1252 and cp850. The cp1252 encoding of "£" is the same as the cp850 encoding of "ú".

   Unicode  cp1252   cp850
£  U+00A3   A3=0243  C9=0311
ú  U+00FA   FA=0372  A3=0243
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* — I'm not sure what the actual distinction is.