- (topology) A one-sided surface formed by identifying two opposite edges of a square in opposite senses.
- A narrow strip given a half twist and joined at the ends, forming a three-dimensional embedding of the above.
narrow strip given a half twist
- The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout#Translations.
Translations to be checked