They are shapes with one side only such as moebius strips.
A moebius strip is easy to make: cut a strip of paper about 2 cm wide and 30 cm long. Take one end, give it a twist (180 degrees) and then stick it to the other end so that you have a ring but with a single twist in it. That is it!
Now, draw a line in the middle of the strip. Continue until you get back to the start of the line. You will find that your line is on both sides of the paper!
Next cut along this line. What do you get when you have cut all round the strip?
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unilateral means limit is 0 to infinite and bilateral means -infinite to +infinite in laplace transform
Unilateral & Isosoles
Only when it is in the form of an equilateral triangle which has 3 equal sides