Perhaps the Giant London Flea Market will start a trend: https://www.queenelizabetholympicpark.co.uk/whats-on/giant-london-flea-market

A number of Slavic, Baltic, Norse, (and also Finnic languages like Finnish and Estonian) use some form of this word for market. It originated in Proto-slavic and passed through Old Norse into descendant languages.

https://en.m.wiktionary.org/wiki/търгъ#Old_East_Slavic

The most interesting thing is that the root appears to have borrowed into Finnish twice, once probably from Slavic (as turku) and once from Old Norse (as tori).

It’s debated. One source points to the lower end of the scale established as the freezing point of a brine made by dissolving ammonium chloride in water.