"an r in the middle of a circle" is the registration symbol "?" , can be typed in the following ways:

1. In Microsoft Excel, you can use "Insert-> Symbol-> Special symbols-> Registration-> The order of "insert" is typed out, as shown in the following figure:

Microsoft Excel "?" Input order

2. At Microsoft? In Word, you can use "insert->; Symbol-> Special symbols-> Registration-> Type out the order of "insert", as shown in the following figure:

Microsoft Word "?" Input order

3. Select the registered trademark symbol "?"in "Special Symbol" in "Symbol Collection" of sogou Input Method. Type it out, as shown in the following figure:

sogou input method? location