Here's some from my EE role:
- The 1% resistor values closest to the 5% resistor series
- The 5% capacitor series
- 2.54
- 3.14159
- 2.71828
- 159kHz ~ 1M Radian/sec, where 1mH = j1k and 1uF = -j1
- Way too many component specifications, such as
2N2222A Betamin = 100
- An arcane corporate part-numbering scheme that
dates back to microfilm and punch cards.
It should work perfectly the first time! - toma