# What does the APRS 'to'/destination address mean?

I'm looking at incoming packets. Here's the beginning of a few messages:

KF7WXW-9>TU3RTW,WIDE1-1,WIDE2-1:2D<..
KX5ONE-9>T5SRPV,WIDE1-1,WIDE2-1:2E0..
KX5ONE-9>T5SRSV,WIDE1-1,WIDE2-1:2E ..
`

So, what to the Txxxxx labels mean? The APRS spec talks about the destination addresses (pg13). Is it related to the MIC-E encoding (pg44)? If so, please break down the encoding in your answer.