FriendlyARM does introduce the term LTS for SBCs 
For the following NanoPis the will now promise LTS:
- NanoPi NEO Core2-LTS = http://www.friendlyarm.com/index.php?ro ... uct_id=211
- NanoPi NEO2-LTS = http://www.friendlyarm.com/index.php?ro ... uct_id=180
- NanoPi NEO Air-LTS = http://www.friendlyarm.com/index.php?ro ... uct_id=151
This is a quote from their webpage and this products:

For the following NanoPis the will now promise LTS:
- NanoPi NEO Core2-LTS = http://www.friendlyarm.com/index.php?ro ... uct_id=211
- NanoPi NEO2-LTS = http://www.friendlyarm.com/index.php?ro ... uct_id=180
- NanoPi NEO Air-LTS = http://www.friendlyarm.com/index.php?ro ... uct_id=151
This is a quote from their webpage and this products:
LTS - long term support, We will not make any changes to this model and will provide support as long as possible