What do the stripes on law enforcement officer' sleeves imply?

As others have actually stated, chevrons on the upper sleeve, above the elbow, suggest rank. 3 chevrons are the most typical, suggesting a sergeant. Some firms include a rocker, listed below the chevrons, to show a greater rank of sergeant, i.e. Sergeant II or personnel sergeant. 2 chevrons might be a corporal or a senior or lead policeman.
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