This seems to have been invented in 2011 to represent GMT+3, non daylight
savings rules, as now used in Europe/Kaliningrad and Europe/Minsk.
There are no conflicts so might as well add it to the Default list.
Per bug #7804 from Ruslan Izmaylov.
# (Europe/Uzhgorod)
# (Europe/Vilnius)
# (Europe/Zaporozhye)
+FET 10800 # Further-eastern European Time
+ # (Europe/Kaliningrad)
+ # (Europe/Minsk)
MEST 7200 D # Middle Europe Summer Time (not in zic)
MET 3600 # Middle Europe Time (not in zic)
METDST 7200 D # Middle Europe Summer Time (not in zic)
# (Europe/Uzhgorod)
# (Europe/Vilnius)
# (Europe/Zaporozhye)
+FET 10800 # Further-eastern European Time
+ # (Europe/Kaliningrad)
+ # (Europe/Minsk)
GMT 0 # Greenwich Mean Time
# (Africa/Abidjan)
# (Africa/Bamako)