Index: doc/user/02_model/index.html
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 	<tr><td> Silk                      <td> Layer group with implicit and potential explicit content  <td> design layers available: automatic, additive, subtractive
 	<tr><td> Paste (paste stencil)     <td> Layer group with implicit and potential explicit content  <td> design layers available: automatic, additive, subtractive
 	<tr><td> N/A, or poss. net/circuit <td> Rats                                                      <td> assistive layer automatically generated with netlist and copper layer group connection data
+	<tr><td> Via                       <td> Padstack                                                  <td> a vertical construction that features a plated hole and copper pads around the hole
+	<tr><td> Pin                       <td> Padstack                                                  <td> a special via that is going to host a pin of a through-hole component soldered on the board
+	<tr><td> Pad                       <td> Padstack                                                  <td> a copper feature that is going to host a lead of an surface mount component
+	<tr><td> Hole, mounting hole       <td> Padstack                                                  <td> special case of vias, with no plating or copper pads
+	<tr><td> Fiducial mark, test pad   <td> Padstack                                                  <td> special case of pad
+	<tr><td> Element, module, part (on board)<td> Subcircuit                                          <td> a placed instance of a library footprint
+	<tr><td> Footprint, land pattern   <td> Footprint                                                 <td> reusable patterns stored in the footprint library
 </table>