Make a personalized bracelet by writing your name with binary code. Use beads to represent 0s and 1s. The key shows black and white squares to make letters in binary code. Choose one color bead to represent the white squares (signifying "1") and another color to represent the black squares (signifying "0"). Add a different colored bead as a "delimiter," or space between letters. Make one for yourself or as a gift for geeky friends. Computer science.