TN is the short written form of Tennessee, a state in the south-eastern United States. American states each have a two-letter code, always two capital letters and no dots, made for addresses on envelopes so the post office can sort mail quickly. You will see it after the city name: Nashville, TN 37201. Now it also turns up anywhere space is short — websites, forms, weather maps, sports tables, the label under someone's name online. This is writing only. When you speak, you say the whole word 'Tennessee'; nobody reads the address out loud as "T-N". Tennessee itself is worth knowing because of music: Nashville is the home of country music, and Memphis, also in Tennessee, is where Elvis Presley lived and where blues and rock and roll grew up.