Freom Wolfe's answers to our questions:
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18. "Describe . . . a voided cross and a gammadion." A gammadion is any figure composed of gamma-shaped pieces. The most common gammadions are the swastika and the voided cross. (The swastika is ancient, by the way, and is found in both East Indian and American Indian art.) To make a voided cross, arrange four gammas, not touching, so that the points point toward a common center.
What are the "points" of a gamma? Is this what he's describing? It's the best I could think of from that description (monospaced font required!). If you need them to be "not touching" to make the voided cross, how are they linked together?
O
O X
OO XXXX
ZZZZ QQ
Z Q
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-Rostrum