http://aprs.org/symbols.html Graphical lookup table and intro
http://www.aprs.org/symbols/symbols.txt Original list (deprecated?) - Updated 24 Jan 2003 http://www.aprs.org/symbols/symbolsX.txt Current primary/alternate symbol list - Updated 25 Nov 2015
http://aprs.org/symbols/symbols-new.txt Symbol overlay list - 16 Oct 2016 Missing digipeaters? http://www.aprs.org/symbols/symbols-overlays.txt Introduction to overlays - 9 April 2007 Only implementation plan. Deprecated?
http://www.aprs.org/newN/n-n-overlays.txt Digipeater overlays - 8 Nov 2007 Current symbols - L S 1 P A X http://www.aprs.org/digi-overlays.html Recommended overlays - 2005? Current symbols - S P 1 https://www.aprsdirect.com/symbol/list Current symbols - /# 1 A D I L N P R S T U
http://www.aprs.org/symbols/symbols-background.txt Concept that symbols are a LUT - 17 April 2008 How to configure UI-View
https://github.com/hessu/aprs-symbol-index Hessu's version of symbolsX.txt https://github.com/hessu/aprs-symbols Vector artwork for symbols