Newbie need help

can someone help me with all the abbreviations used on this website? things like POD and other ones? also whats with the unmentionable Sea mammal? i know what animal it is but why is it unmentionable? Thanks to all this website Freakin RULES
 
can someone help me with all the abbreviations used on this website? things like POD and other ones? also whats with the unmentionable Sea mammal? i know what animal it is but why is it unmentionable? Thanks to all this website Freakin RULES

OTL=Original Timeline
ATL=Alternate Timeline
POD=Point of Divergence (i.e.What happens in OTL to make it ATL.)
ASB=Alien Space Bats (generally used to describe something impossible or to do with fiction.)
Unmentionable Sealion= Operation Sealion (the planned invasion of the UK by Germany in WW2. It was so impossible but so overused in alt history people here hate it so that's why it's unmentionable.)
 
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