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HARM (for High Accuracy Relativistic Magnetohydrodynamics) is a code to solve general-relativistic MHD (GRMHD) problems.
One later adaption of HARM is H-AMR (for HARM-AMR), a GPU-accelerated version that uses adaptive mesh refinement (AMR).
Note that HARM² (for Hybrid Adaptive Ray-Moment Method) is an unrelated code.