probably music notation. 
though I’m fairly certain the true answer for all of us is domain specific idioms that are as invisible to us as water is to fish.
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
TED-style expository talks. It's the only thing I feel I have a abnormal fluency in. Years later people will say oh yeah I saw your talk on XYZ, and it's literally the only thing they remember about me or my work.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
code
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
Sadly, design software
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
English. Not my native language in the least.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
raconteuring
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
Well maybe 2x2s