What does Java option -Xmx stand for? [duplicate]

see here: Java Tool Doc, it says, -XmxnSpecify the maximum size, in bytes, of the memory allocation pool. This value must a multiple of 1024 greater than 2MB. Append the letter k or K to indicate kilobytes, or m or M to indicate megabytes. The default value is 64MB. The upper limit for this value will …

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