OP_CAT was originally an opcode in Bitcoin. It was disabled in 2010 but slight variations on it are frequently proposed to be added to Bitcoin using a soft fork.
Both the original OP_CAT and the new proposals for it concatenate two elements on the stack into a single element.
The primary expected use for OP_CAT is for data provided by the creator of a script to be concatenated with data provided by someone spending from that script.
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