Naming Project components You can use any name for the components in your Design Center Project with the exceptions shown below. Maximum number of characters The maximum number of characters in a name is 63. Invalid characters The following ASCII characters are invalid. In ASCII table Character Character 0-31 null to unit separator 34 “ 42 * 47 / 58 : 60 < 62 > 63 ? 92 \ 124 | Invalid strings The following text strings cannot be used as names. • AUX • CLOCK$ • COM1 • COM2 • COM3 • COM4 • COM5 • COM6 • COM7 • COM8 • COM9 • CON • LPT1 • LPT2 • LPT3 • LPT4 • LPT5 • LPT6 • LPT7 • LPT8 • LPT9 • NUL • PRN