Koans are often called "zen riddles". They are statements that cause the student to abandon logic as the route to understanding. They do not necessarily follow the riddle format (What is... ?) but can be simple statement like "Show me the face you had before you were born."
Koans do not have "no meaning" although they may not have an easily explained or consistent answer. The meaning may be nested layer upon layer with the answers being koans themeselves.
Zeno of Elea created different riddles called aporias, for example "Achilles and turtle".
It refers to a circular symbol with various meanings in Zen Buddhism often seen in Japanese calligraphy.
A homophone riddle book is a collection of riddles that play on words which sound alike but have different meanings, known as homophones. Readers must solve the riddles by identifying the correct homophone to unlock the answer.
Riddles at present
riddles = Rätsel.
riddles in batanic language
Riddles originated from well they were made by "Rhind Mathematical Papyrus.
Castle of Riddles was created in 1982.
Castle of Riddles happened in 1982.
Nat Riddles died in 1991.
Nat Riddles was born in 1952.
The Riddles of Epsilon was created in 2005.