What's the meaning of these period signs in this file?

[MQi.1]

I read the "STM32WB09KEVX_FLASH.ld" of STM32WB09KE, could anyone tell me what's the meaning of these period sign in this file?

/*******************************************************************************
* STM32WB09 generic linker file for GCC
* Main linker variables to control it are:
*
* MEMORY_FLASH_APP_SIZE: define the size of the application in case not all the flash is needed.
* Default value is: 508KB when no OTA firmware upgrade is supported
*
* MEMORY_FLASH_APP_OFFSET: define the offset of the application.
* Default value is: 0 offset
*
* MEMORY_RAM_APP_OFFSET: define the offset in RAM from which variables can be
* allocated.
*
*******************************************************************************/

/*******************************************************************************
* Memory Definitions
*******************************************************************************/
/*
STM32WB09 memory map
+-----------------------+ 0x2000FFFF
|  RAM (64K)            |
+-----------------------+ 0x20000000
|                       |
|                       |
+-----------------------+ 0x100BFFFF
|                       |
|  FLASH (512K)         |
+-----------------------+ 0x10040000
|                       |
+-----------------------| 0x100017FF
|   ROM (6K)            |
+-----------------------+ 0x10000000
*/


_MEMORY_RAM_BEGIN_   = 0x20000000;
_MEMORY_RAM_SIZE_    = 0x10000;     /*  64KB  */
_MEMORY_RAM_END_     = 0x2000FFFF;

_MEMORY_FLASH_BEGIN_ = 0x10040000;
_MEMORY_FLASH_SIZE_  = 0x80000;          /* 512KB */
_MEMORY_FLASH_END_   = 0x100BFFFF;

_MEMORY_ROM_BEGIN_   = 0x10000000;
_MEMORY_ROM_SIZE_    = 0x01800;          /* 6KB */
_MEMORY_ROM_END_     = 0x100017FF;


/* Reserved for BTLE stack non volatile memory */
FLASH_NVM_DATASIZE   = (4*1024);


MEMORY_FLASH_APP_OFFSET = DEFINED(MEMORY_FLASH_APP_OFFSET) ? (MEMORY_FLASH_APP_OFFSET) : (0) ;
MEMORY_FLASH_APP_SIZE = DEFINED(MEMORY_FLASH_APP_SIZE) ? (MEMORY_FLASH_APP_SIZE) : (_MEMORY_FLASH_SIZE_ - FLASH_NVM_DATASIZE - MEMORY_FLASH_APP_OFFSET);


/* Entry Point */
ENTRY(Reset_Handler)


/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0x0; /* required amount of heap  */
_Min_Stack_Size = 0xC00; /* required amount of stack */

/* Specify the memory areas */
MEMORY
{
  RAM (xrw)              : ORIGIN = _MEMORY_RAM_BEGIN_, LENGTH = _MEMORY_RAM_SIZE_
  FLASH (rx)             : ORIGIN = _MEMORY_FLASH_BEGIN_ + MEMORY_FLASH_APP_OFFSET, LENGTH = MEMORY_FLASH_APP_SIZE
  REGION_NVM (rx)               : ORIGIN = _MEMORY_FLASH_END_ + 1 - FLASH_NVM_DATASIZE, LENGTH = FLASH_NVM_DATASIZE
  REGION_ROM (rx)               : ORIGIN = _MEMORY_ROM_BEGIN_, LENGTH = _MEMORY_ROM_SIZE_
}

/* Define output sections */
SECTIONS
{

  /* The startup code goes first into FLASH */
  .intvec (ORIGIN(FLASH)) :
  {
    . = ALIGN(4);

    KEEP(*(.intvec)) /* Startup code */

    . = ALIGN(4);
  } >FLASH


  /* The program code and other data goes into FLASH */
  .text :
  {
    . = ALIGN(4);

    KEEP(*(TAG_OTA_START))

    KEEP(*(.cmd_call_table))
    *(.text)           /* .text sections (code) */
    *(.text*)          /* .text* sections (code) */
    *(i.*)             /* i.* sections (code) */
    *(.constdata)
    *(.glue_7)         /* glue arm to thumb code */
    *(.glue_7t)        /* glue thumb to arm code */

    . = ALIGN(4);
     _etext = .;
  } >FLASH

  /* Constant data goes into FLASH */
  .rodata :
  {
    . = ALIGN(4);
    *(.rodata)         /* .rodata sections (constants, strings, etc.) */
    *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
    . = ALIGN(4);
  } >FLASH

  .ARM.extab (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
  {
    *(.ARM.extab*)
  } >FLASH

  .ARM (READONLY) : /* The READONLY keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
  {
    __exidx_start = .;
    *(.ARM.exidx*)
    __exidx_end = .;
  } >FLASH

  /* used by the startup to initialize data */
  _sidata = LOADADDR(.data);

  /* RAM preamble, uninitialized */
  .ram_preamble 0x20000004 (NOLOAD) :
  {
    KEEP(*(.ram_vr))
  }  >RAM

  /* RAM preamble, unininitialized */
  .ram_preamble_2 0x20000034 (NOLOAD) :
  {
    KEEP(*(.crash_info_ram_vr))
  }  >RAM
  /* Uninitialized data section */

  .bss.blueRAM 0x200000C0 :
  {
    . = ALIGN(4);
    _sbssblue = .;         /* define a global symbol at .bss.blueRAM start */
    KEEP(*(.bss.__blue_RAM))
    . = ALIGN(4);
    _ebssblue = .;         /* define a global symbol at .bss.blueRAM end */
  } >RAM

  .bss DEFINED(MEMORY_RAM_APP_OFFSET) ? (ORIGIN(RAM) + MEMORY_RAM_APP_OFFSET) : . :
  {
    . = ALIGN(4);
    _sbss = .;         /* define a global symbol at bss start */
    *(.bss)
    *(.bss*)
    *(COMMON)
    . = ALIGN(4);
    _ebss = .;         /* define a global symbol at bss end */
  } >RAM

  /* Initialized data sections goes into RAM, load LMA copy after code */
  .data :
  {
    . = ALIGN(4);
    _sdata = .;        /* create a global symbol at data start */
    *(.data)           /* .data sections */
    *(.data*)          /* .data* sections */

    . = ALIGN(4);
    _edata = .;        /* define a global symbol at data end */
  } >RAM AT> FLASH

  /* Data section that will not be initialized to any value. */
  .noinit (NOLOAD):
  {
    . = ALIGN(4);
    *(.noinit)
    . = ALIGN(4);
  } >RAM

  .ota_region_end :
  {
	. = ALIGN(4);
	KEEP(*(TAG_OTA_END))
	. = ALIGN(4);
  } >FLASH

  .heap (NOLOAD):
  {
    . = ALIGN(4);
    PROVIDE ( end = . );
    PROVIDE ( _end = . );
    . = . + _Min_Heap_Size;
    . = ALIGN(4);
  } >RAM

  .stack (ORIGIN(RAM) + LENGTH(RAM) - _Min_Stack_Size) (NOLOAD) :
  {
    . = ALIGN(4);
    . = . + _Min_Stack_Size;
    . = ALIGN(4);
    _estack = .;         /* define a global symbol at stack end */
    . = ALIGN(4);
  } > RAM


  .rom_info (NOLOAD) :
  {
    . = ALIGN(4);
    KEEP(*(.rom_info))
    . = ALIGN(4);
  } >REGION_ROM

  /* Remove information from the standard libraries */
  /DISCARD/ :
  {
    libc.a ( * )
    libm.a ( * )
    libgcc.a ( * )
  }

  .ARM.attributes 0 : { *(.ARM.attributes) }
}

is it mixture of any assembly language and C?