ASCII

ASCII character codes that I think will work for everybody.  On many systems you can make these by holding down ''alt'' and typing the number of the character in question.

 128 Ç   136 ê   144 É   152 ÿ   160 á   168 ¿
 129 ü   137 ë   145 æ   153 Ö   161 í   169 ®
 130 é   138 è   146 Æ   154 Ü   162 ó   170 ¬
 131 â   139 ï   147 ô   155 ø   163 ú   171 ½
 132 ä   140 î   148 ö   156 £   164 ñ   172 ¼
 133 à   141 ì   149 ò   157 Ø   165 Ñ   173 ¡
 134 å   142 Ä   150 û   158 ×   166 ª   174 «
 135 ç   143 Å   151 ù   159 ƒ   167 º   175 »

In particular hoping that everyone sees 158 as a cross - the mathematics section needs something like that for cartesian products.