title: What does rt stands for in MIPS instruction format?
body: <p>Take MIPS instruction format described <a href="http://www.cs.umd.edu/class/sum2003/cmsc311/Notes/Mips/format.html">here</a>, there are some abbreviations eg rd,rs and rt. What does rt stands for? I know rt is the second source register in R-type instruction, and is the destination register in I-type instruction. It is easy to guess rd stands for register destination; rs stands for register source. What about rt?  I guess it might be "register temporary"? Is there an authoritative source about this?</p>