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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
We've still got the photograph of him posing in his khaki uniform with the distinctive Red Cross cap badge.
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.