I believe it was one out of three possible options (other than degrees and radians) to represent angles on my high school scientific calculator. Accidentally s

I believe it was one out of three possible options (other than degrees and radians) to represent angles on my high school scientific calculator. Accidentally staying in "grad" mode when cycling through them (DEG -> RAD -> GRAD) was always a concern, especially since the difference between RAD and GRAD was easy to miss on the small LCD display (the indicator was via partial selection of the letters within a mask spelling "DEGRAD").