It is shaped like the letter S
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The graph of a logistic population growth is shaped like the letter "S" or an elongated "S". It starts with exponential growth, then slows down as it approaches the carrying capacity before eventually leveling off.
Vietnam war
Himalayas
Vietnam.
The trombone is shaped like that so it can produce a fuller and louder sound. :)
The Greeks don't (and didn't) use any letter shaped like that. A number of words begin with sigma (which sounds like s) although it is rather infrequent eg "sigma", "sou" "soi"
The main difference between a p-trap and an s-trap in plumbing systems is their shape and how they prevent sewer gases from entering the building. A p-trap is shaped like the letter "P" and retains water to create a seal, while an s-trap is shaped like the letter "S" and is prone to siphoning, which can break the seal and allow gases to enter.
The Roman numeral for 0.5 or 1/2 is shaped like the letter S and its Latin name is 'semis' which means a half.
Vietnam is in Asia. The small 'S' shaped country underneath China.
an S