A family of Microsoft word processing software products for creating web, email, and print documents.
Although you can use a macro for this, it isn't necessary. You can assign a shortcut key directly to a symbol such as the arrows.
On the Insert ribbon, click the Symbol button and choose More Symbols from the dropdown to open the Symbols dialog. Set the Font dropdown to "(normal text)" which is the default, and set the "from" box in the lower right to "Unicode (hex)". Open the Subset dropdown in the upper right to "Arrows" (it's about 2/3 of the way down the list).
Click on the up arrow (character code 2191) and click the Shortcut Key button at the lower left. In that dialog, click in the "Press new shortcut key" box and press the key combination you want, then click the Assign button before clicking Close. In the Symbol dialog, click on the down arrow (character code 2193) and assign another shortcut key to that one.