[comment][/comment] - This tag creates a semi-hidden comment inside a post. The text included inside the comment tags will only appear if the post is quoted or edited. For the technical minded, it also includes the enclosed text in an HTML comment in the source as well.

[gamercard][/gamercard] - This displays your XBox Gamer Card in your post (or, more commonly, in your signature). For this to work, you need to include your XBox Network Account ID between the gamercard tags.

[hr] - This creates a horizontal rule, a line that divides content above the rule from the content below the rule. Unlike other BBCode tags, this doesn’t have a closing tag, nor does it allow for any additional information. To use it, you simply type the single tag.

[nbsp] - This creates a single non-breaking space. Normally, when you type text in a post, it doesn’t matter how many spaces you put between words, when the post is displayed on the browser, it will always show one space. If you want to make sure that you have the correct number of spaces, and don’t want to use the PRE tags, you can use [nbsp]. This will create a single space that will always show on the browser. You can use as many of these as is necessary to display your post, although if you have to use a lot, you might want to consider using the PRE tags instead. Like the HR tag, this doesn’t have a closing tag, nor does it allow for any additional information.

[ps3pid][/ps3pid] - This displays your PlayStation Network ID Card in your post (or, more commonly, in your signature). For this to work, you need to include your PlayStation Network ID in between the ps3pid tags.

[reverse][/reverse] - This entertaining yet simple BBCode will reverse the text that has been included in between the tags.

[tab] - A tab is typically a five-space indention at the beginning of a paragraph. In the case the the [tab] tag, it is simply five, non-breaking spaces in a row. The typical use would be for indenting the first line of a paragraph, but can be used to add the equivalent of five [nbsp] tags in a row. Like HR and NBSP, it doesn’t have a closing tag, nor does it allow for any additional information.

[table][/table] = This is used to set the beginning and end points of the table. The table contains rows, and those rows contain cells.
[tr][/tr] = Table row. Every table must have at least one row. This would be in between the table tags.
[th][/th] = Table header cell. The first row can optionally contain header cells. These are specially formatted cells that identify that as a header. The text in between these tags would be displayed in the header.
[th=number][/th] = The number following the th, in this case, specifies the number of columns that this header cell takes. This is usually set to 2 or higher to split across several columns.
[td][/td] = Table data cell. This is one cell of information. The text in between the tags is what displays in the cell.
[td=colnumber,rownumber][/td] = The numbers following the td specifies the number of columns that the cell takes and the number of rows that this cell takes. This allows the cell to span several columns and rows.

Note: The entire table must be on one line, with no line breaks in between (word wrap in the text box is okay). The only exception is inside a cell. You are able to have a line break (carriage return, enter) inside a cell. If you do have extra spaces or carriage returns (as you might if you were writing this in HTML), you might see some extra blank lines above the table that you don’t want.