Symbol not available from Symbols dialogCertain symbols are not available when using the Insert Symbols tool in the Text Editor - Word Processor dialog. When trying to insert diameter symbol for example, it is not available in the Insert Symbol dialog
The selected font may need to be changed.Some font libraries will not have certain symbols available. If the symbol needed to be inserted is not available in the Insert Symbol dialog, return to the Text Editor - Word Processor and change the font. Then check the Symbol library for that font
http://communities.bentley.com/products/microstation/w/microstation__wiki/14544.wrong-characters-for-degree-symbol
http://communities.bentley.com/products/microstation/w/microstation__wiki/15197.diameter-symbol