TIL why (in British English) we don't use a dot after the “St” short form of “Street”.
The “t” in “St” is *not* the second letter of “Street”, but the sixth. So it's not an abbreviation (like “Prof.” for “Professor”, “etc.” in “et cetera”, etc.), it's a contraction (like “Dr” in “Doctor”, “Mr” in “Mister”, “St” in “Saint” and so on) and contractions don't have a dot.
🤯
I assumed it was just a weird English thing, but turns out I found the only language feature that's entirely consistent 
I thought the long form was “missus” but of course that has no “r” 
@carusb @markmason @yrlaNor My research on the only case I know (Discworld's Granny Weatherwax insisting on being called “Mistress Weatherwax” by those she didn't like) has led me to this esteemed organ:
“‘Mr.’ started as ‘Master’ (as in, ‘the master of their craft,’ especially since many last names originated from people’s trades), and was pronounced as ‘Mister’ before getting contracted to ‘Mr.’ So having people call you ‘Mister [name]’ was a sign of deference. ‘Mistress’ was the equivalent of ‘Master’ before getting contracted to ‘Missus’ and ‘Mrs.’, and it too was an honorific that referred to a woman who was at the top of her game. And that’s why there’s an extra ‘r’ in ‘Mrs.’ even though we pronounce it ‘missus.’”
Andy Alderwick
yrlaNor
Mark Mason
ChrisR