The Free On-line Dictionary of Computing (30 December 2018):

code segment
text segment

    (Intel 8086 CS) The area of memory containing the
   machine code instructions of a program.  The code segment
   of a program may be shared between multiple processes running
   that code so long as none of them tries to modify it.

   Unix, confusingly, calls this the "text segment" and the
   area for uninitialied data, the bss segment.

   Initialised data is located in the data segment.

   (1996-12-21)