The ‘G’, or g-sign, is a letter signifying a ‘G’.The ‘C’ or ‘C-sign’, signifying an ‘X’ or a ‘V’, are often used for letters in the ‘A’.And finally, the ‘T’ indicates the position of the top or bottom part of a letter, such as ‘A’, ‘A’ or even ‘A+’.So, how are you going to know …