Our school (high school) uses
A+ 98-100
A 93-97
A- 90-92
B+ 87-89
B 83-86
B- 80-82
C+ 77-79
C 73-76
C- 70-72
D+ 67-69
D 65-66
F <65

Teachers do not enter letter grades, only % grades. The system generates the letter grades. Qualitatively, a C is supposed to mean meeting basic standards, B is proficient, and A is advanced. D basically means you received credit for the course.

And, of course, it's all converted to a 4.0 scale for transcript purposes.

I like HK's system. I had one o-chem prof who graded on a weighted curve, which was good on the midterm for which the class mean was in the lower teens. (I'm proud to say I did just manage to beat the curve!)

...pronounced like the long vowel and first letter of the alphabet...