Skill Tree

http://hellgate.incgamers.com/wiki/Summoner_Skills

This skill tree map shows the potential areas for character upgrades in a given game, as the player gains experience points they will be able to unlock certain abilities but only in accordance to following the order on the tree and its connecting branches. 

PLSS- Systematic Land Partioning

http://www.nationalcad.org/onlineed/standard/mn-exmpl.htm

This PLSS map shows a Systematic Land Partition in Minnesota. This type of quadrangle plot increases clarity of communication about cadastral matters between cooperating organizations as well as showing distinct boundaries of property and townships.