$
The spelling label is used when the subject spells a name letter by letter,
e.g. for referring to the orthography or in abbreviations like USA. Each
single letter is preceded by a $-label. The letters are always uppercase
and separated by a comma or a dash, the latter mostly in abbreviations.
w001_ptd_001_AAA: mein Name ist ~Meier , $M , $E , $I , $E , $R .
w001_ptd_001_AAA: ich nehme in den $U-$S-$A nicht gerne die
$U-Bahn .