diff --git a/index.html b/index.html
index f2c2c0c8..85e9ee45 100644
--- a/index.html
+++ b/index.html
@@ -7706,6 +7706,11 @@
       </g>
 
       <g id="resource-icons">
+        <symbol id="resource-unknown" viewBox="-3 0 40 40">
+          <metadata description="Question mark by Azgaar" author="Azgaar" license="https://creativecommons.org/publicdomain/zero/1.0"/>
+          <path d="m 26.7,12.8 q 0,1.9 -0.7,3.4 -0.7,1.5 -1.8,2.6 -1.1,1.1 -2.5,2.1 -1.4,1 -3,1.9 v 4.4 h -3.5 v -6 q 1.2,-0.7 2.7,-1.6 1.5,-0.8 2.4,-1.7 1.1,-1 1.8,-2.1 0.6,-1.1 0.6,-2.8 0,-2.2 -1.5,-3.23 -1.5,-1.1 -3.9,-1.1 -2.1,0 -4,0.67 -1.8,0.66 -2.9,1.36 h -0.2 v -4 q 1.3,-0.53 3.4,-0.94 2.1,-0.43 4,-0.43 4.2,0 6.6,2.05 2.5,2.03 2.5,5.42 z M 19,35 h -4 v -4.1 h 4 z" fill="#fff" stroke="#000" stroke-width="1"/>
+        </symbol>
+
         <symbol id="resource-wood" viewBox="0 -8 90 110">
           <metadata description="Wood by Callum Taylor from the Noun Project, redrawn by Azgaar" source="https://thenounproject.com/search/?q=Wood&i=53364" license="https://creativecommons.org/licenses/by/3.0"/>
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