Greek letters in acronym

Question

I want to use the acronym package for a list of acronyms. When posting Greek letters like such:

\acro{$\nu$}{frequency}

I get errors

! Missing \endcsname inserted

What does that mean and how do I fix that?

Answer 1

See section "2.3 Defining acronyms" of acronyms documentation:

\acro{nu}[$\nu$]{freqency}

The first argument is the name to address the acronym (\ac{nu}, ...), the printed short form is taken from the optional argument. The name of the acronym can only be stuff that survive \csname...\endcsname like the argument of \label or \ref.