oikein-merkki (englanniksi)

symbol consisting of slash and two dots (s: /)
one on the upper left side of the slash and the other on the lower right side. Alternative way to describe the symbol is that it's like a %-sign in which the o's are replaced with dots. This symbol is used in Finland to indicate agreement (s)
correctness or acknowledgement. When ticking a box (s)
X is normally used as the sign of acceptance (s: m)
checkmark (s)
tick (s: mark made to indicate agreement, correctness or acknowledgement)
see also "Usage notes" below (s)