The Collaborative International Dictionary of English v.0.48:

Anna \An"na\, n. [Hindi [=a]n[=a].]
   An East Indian money of account, the sixteenth of a rupee, or
   about 2? cents.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anna
    n 1: a former copper coin of Pakistan and India

The Free On-line Dictionary of Computing (19 January 2023):

ANNotated Ada
Anna

    (Anna) A specification language
   developed at Stanford University ca. 1980 for formally
   specifying Ada programs.  It has a Specification Analyzer
   and a Consistency Checking System.  It adds semantic
   assertions in the form of Ada comments.

   (ftp://anna.stanford.edu/pub/anna/).

   ["ANNA - A Language for Annotating Ada Programs", David
   Luckham et al, Springer 1987].

   (1994-11-01)