A comment is text that is written in a program only for the sake
of humans that read the program, and that has no effect on the
meaning of the program. In Lisp, a semicolon (‘;’) starts a
comment if it is not within a string or character constant. The
comment continues to the end of line. The Lisp reader discards
comments; they do not become part of the Lisp objects which
represent the program within the Lisp system. The ‘#@count’
construct, which skips the next count characters, is useful for
program-generated comments containing binary data. The Emacs
Lisp byte compiler uses this in its output files (see Byte
Compilation). It isn't meant for source files, however. See
Comment Tips, for conventions for formatting comments.