NB! It seems this console command is not compatible with CS2.
Command Profile

NEEDBACKUP

CS:GO

This command makes your character perform the "Need Backup!" radio command sending a message in chat and over sound.

Syntax
needbackup

Description

This command makes your character perform the "Need Backup!" radio command sending a message in chat and over sound.

How To Use needbackup

  1. Enable the developer console in Counter-Strike settings.
  2. Open the console with the tilde key (~).
  3. Enter needbackup, replacing bracketed arguments with the value you want, then press Enter.

This legacy command is not currently listed as compatible with Counter-Strike 2.

Syntax And Arguments

needbackup