cross-cap

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cross-cap

[′krȯs ‚kap]
(mathematics)
The self-intersecting surface that results when a Möbius band is deformed so that its boundary is a circle.
References in periodicals archive ?
For his labors, Ian received a certificate of commendation, a Red Cross cap and Red Cross bank and a firefighter's red T-shirt and plastic helmet.
An indignant Scotsman is incensed that Harry sported a St George's Cross cap and an England shirt while watching England versus South Africa.
Cross caps on the tops of the posts were set with blind mortise/tenon; they were also perfect.