The Collaborative International Dictionary of English v.0.48:

2 \2\ adj.
   Denoting a quantity consisting of one more than one; one plus
   one more; -- representing the number two as an Arabic
   numeral.

   Syn: two, ii
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

2
    adj 1: being one more than one; "he received two messages" [syn:
           two, 2, ii]
    n 1: the cardinal number that is the sum of one and one or a
         numeral representing this number [syn: two, 2, II,
         deuce]

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

2

    In names of translation software,
   infix 2 often represents the word "to" with the connotation
   "translate to", as in dvi2ps (DVI to PostScript),
   int2string (integer to string) and texi2roff (Texinfo to
   [nt]roff).

   [Jargon File]

   (1995-01-25)


The Jargon File (version 4.4.7, 29 Dec 2003):

2
 infix.

    In translation software written by hackers, infix 2 often represents the
    syllable to with the connotation ‘translate to’: as in dvi2ps (DVI to
    PostScript), int2string (integer to string), and texi2roff (Texinfo to [nt]
    roff). Several versions of a joke have floated around the internet in which
    some idiot programmer fixes the Y2K bug by changing all the Y's in
    something to K's, as in Januark, Februark, etc.