'Die Wahre und die Scheinbare Bahn des Halley'schen
Kometen..'
View page
Bimetallic strip
View page
mobius strip
View page
The recycling symbol is an internationally recognized symbol
used to designate recyclable materials. The symbol is composed of 3
mutually chasing arrows that form a Möbius strip. The symbol was
created in the year 1969 by Gardy Anderson.