"Basis points" & "precentage points"
Going by wikipedia a precentage point is 1%, so the difference between 20% and 30% is 10 percentage points, a basis point is one hundredth of a percent, so 0.01%, so if the ECB base rate went from 3.5% to 3.25% it has changed 25 basis points.
The were very in vogue when we were obsessing about "bond yields" - I nearly get queasy at the mention of the phrase.
Anyway I think percentage points and basis points have been used interchangeably by commentators (must watch it more closely now that I've clarified it for myself), so I usually have to do a "sanity check" to see what would make sense.
There's another one "sanity check" - used by people who work on spreadsheets and in technical areas when asking a colleague to briefly review something - for fear one might have made a complete hash of it (a la the Dept of Finance!)