To get † symbol use Alt+0134
To get ‡ symbol use Alt+0135
To create the trade mark (™) symbol use Alt+0153
To get bound sterling (£) symbol use Alt+0163
To get the Japanese currency yen (¥) symbol use Alt+0165
To get copy right symbol (©) use Alt+0169
To get registered trade mark symbol (®) use Alt+0174
To get degree symbol (°) use Alt+0176
To show (±) symbol use Alt+0177
To show super script 2 symbol (²) use Alt+0178
To show super script 3 symbol (³) use Alt+0179
To make a center dot symbol (•) use Alt+0183
To describe ¼ use Alt+0188
To describe ½ use Alt+0189
To describe ¾ use Alt+0190

We can create more symbols as same as above. We mostly use the above symbols. To see more combinations of symbols visit at http://home.earthlink.net/~awinkelried/keyboard_shortcuts.html