The Janka wood hardness rating is a relative measurement of the wood's impact resistance and wear resistance.  It is basically an evaluation of a wood's hardness.  The higher the rating, the harder is the species of wood.  Brazilian hardwoods rank at the top of the scale for all woods.  Ipé, Cumaru, Massaranduba, and Jatoba are some of the worlds hardest woods.   All Brazilian Hardwood even including Tigerwood, Sucupira, Garapa are harder than Maple or Oak.