A section is a set of zero, one, or more paragraphs or entries (called
  a section body) that follows a section header and related section body.

  A section header identifies and marks the beginning of a section in the
  Environment, Data, and Procedure Divisions.  In the Environment and
  Data Divisions, a section header is a specific combination of reserved
  words followed by a separator period.  In the Procedure Division, a
  section header is a user-defined word followed by the word SECTION (and
  an optional segment-number).  A separator period always follows a
  section header.