https://westmetxcclubs.com.au/index.php/2017/10/20/props-also-known-as-exotic-wagers-are-also-extremely-popular-on-high-profile-team-sporting-events-like-the-super-bowl/
Props, also known as exotic wagers, are also extremely popular on high profile team sporting events...
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https://winningponies.com/blog/the-29th-breeders-cup-its-exotic-wagers-horseplayers
2012 Breeders' Cup: Exotic Wagers & Race Analysis
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