database.mod/postgresql.mod/include/catalog/pg_collation.dat

#----------------------------------------------------------------------
#
# pg_collation.dat
#    Initial contents of the pg_collation system catalog.
#
# Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
# Portions Copyright (c) 1994, Regents of the University of California
#
# src/include/catalog/pg_collation.dat
#
#----------------------------------------------------------------------

[

{ oid => '100', oid_symbol => 'DEFAULT_COLLATION_OID',
  descr => 'database\'s default collation',
  collname => 'default', collprovider => 'd', collencoding => '-1' },
{ oid => '950', oid_symbol => 'C_COLLATION_OID',
  descr => 'standard C collation',
  collname => 'C', collprovider => 'c', collencoding => '-1',
  collcollate => 'C', collctype => 'C' },
{ oid => '951', oid_symbol => 'POSIX_COLLATION_OID',
  descr => 'standard POSIX collation',
  collname => 'POSIX', collprovider => 'c', collencoding => '-1',
  collcollate => 'POSIX', collctype => 'POSIX' },

]