It stands for "Justices". If it's a single "J" it means it's the opinion of one Justice. If there is a list of more than one Justice followed by a comma and "JJ" it's just a shorthand way of saying "Justices".
If one Justice filed a dissent to a decision it might read "Thomas, J. filed a dissenting opinion.", meaning only Clarence Thomas dissented. If it read "Thomas, Scalia, Roberts and Alito, JJ. filed a dissenting opinion." then it means the four of them filed the dissenting opinion together. That way they don't have to type "Thomas, J., Scalia, J., Roberts, J. and Alito, J. filed a dissenting opinion."
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The correct name is the Supreme Court of the United States, but most people refer to it as the US Supreme Court. Each state has its own Supreme Court, but the US Supreme Court is the end of the line.
The US Supreme Court is the highest court in the US. Each state has its own Supreme Court, but the US Supreme Court is the end of the line.
U.S Supreme Court
The US Supreme Court is the highest appellate court in the United States.
In most cases a Supreme Court decision is permanent. The current Supreme Court can change the decision of a previous Supreme Court.