\scr - Turns on script typestyle for uppercase letters; lowercase letters are in a roman typestyle.
{ \scr ...}
\scr command is used to turn on script typestyle for uppercase letters; lowercase letters are in a roman typestyle.
\scr ABCDEFGHIJKLMNOPQRSTUVWXYZ
\scr 0123456789abcdefghijklmnopqrstuvwxyz
0123456789abcdefghijklmnopqrstuvwxyz
{\scr AB}AB
\scr AB \rm AB
\scr{AB}CD