\mathsf - Used to turn on sans serif typestyle for uppercase and lowercase letters and digits; also affects uppercase greek.
{ \mathsf #1 }
\mathsf command is used to turn on sans serif typestyle for uppercase and lowercase letters and digits; also affects uppercase greek.
\mathsf{ABCDEFGHIJKLMNOPQRSTUVWXYZ}
\mathsf{0123456789}
\mathsf{abcdefghijklmnopqrstuvwxyz}
\Delta\Gamma\Lambda\mathsf{\Delta\Gamma\Lambda}
abcdefghijklmnopqrstuvwxyz
\mathsf{AB}AB