The ⅔ symbol has the meaning Vulgar fraction two thirds. It belongs to the category Numeral. The symbol represents a fraction which has the number two in the numerator and the number three in the denominator. In decimal notation, the fraction two thirds would converted to 0.66. In percent, it would be 66.66%. Incidentally, fraction two thirds is exactly the value that lies in the middle of 50% and 100%. If you want to copy the ⅔ sign of the break a third, you can do this below.