10-4 (ten-four)

"10-4" is part of the ten-codes, a series of brevity codes used in two-way radio communication. Originating in law enforcement and emergency services, it signifies acknowledgment or that a message has been received and understood. For example, if someone says, "Can you meet me at the location?" responding with "10-4" indicates agreement without needing a lengthy reply. It's become popular in pop culture, often associated with truckers and other drivers, symbolizing clear communication in a concise format. Overall, "10-4" is about confirming understanding in a straightforward way.