What command signifies that a lifter can start their squat?

The command that signifies a lifter can start their squat is "Squat" from the head referee. This command is critical as it serves as the official signal for the lifter to begin their squat attempt. The head referee is responsible for issuing this command to ensure that the lifter is ready and that all officials are prepared to observe the lift according to the competition rules.

The use of specific commands is an essential part of the lifting process in powerlifting, as it maintains consistency and clarity during the competition. In contrast to other commands like "Bench" or "Ready," which pertain to different lifts or stages of preparation, "Squat" is the distinct identifier that initiates the squat attempt itself. This ensures that the lifter can perform their lift in an organized manner, under the supervision of the judges, which contributes to safety and adherence to the competition protocol.