Not many constants, in fact.
0150 — the code of a dash in windows; 0x2014 — the unicode of a dash. Also a lot of character codes, especially the CWI ones. In the DOS days, you had to know them. (I've forgotten them now.)
Powers of 2 up to 65536 (1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768 65536).
Oh, and 0 == SEEK_SET.
Update. It seems that no-one has mentioned 273 K ~= 0oC.
Also noF == ((n-32)*10/18)oC. And 1 in == 25.4 mm.
Update. Yes, I know my social security number too, although that's of no use.
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