<td>The arcade system this sub-site focuses on. Sometimes abbreviated RE2.</td>
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<td>RingEdge</td>
<td>The predecessor to the RE2. While not directly documented, the majority of things that apply to RE2 also apply to RE. Sometimes abbreviated RE.</td>
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<td>RingWide</td>
<td>A less powerful arcade system based on the RingEdge series. Sometimes abbreviated RW.</td>
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<td>Nu</td>
<td>The successor to the RingEdge 2. Not documented here, and a substantially different system.</td>
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<td>ALLS</td>
<td>The successor to Nu. Not documented here, and even moreso different. Not to be confused with ALL.Net</td>
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<td>Ring*</td>
<td>Used to simultaniously refer to RingWide, RingEdge, and RingEdge 2</td>
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<td>Ring</td>
<td>Sometimes used in lieu of Ring* when lazy</td>
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<td>EDGE2</td>
<td>The official codename for RingEdge 2</td>
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<td>Madoka</td>
<td>The official codename for RingEdge</td>
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<td>Renge</td>
<td>The official codename for RingWide</td>
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<td>JVS</td>
<td>JAMMA Video Standard. Unless specified otherwise, this refers to JVS version 2.</td>