Because I am very literal-minded at times, there are some descriptions that - even though I know the current definition/descriptions for the term - do not seem to be adequate.
HST's for one. I can live with "HST units" for a square made of two triangles - but just HST for the unit irritates me.
Most of the time I have more useful things to fret about.
When I can't sleep at night, I see how far I can go with prime numbers. So far, every one that is greater than five, is either one less or one more than a number that is evenly divisible by 6.