Odd stamps : 08 Stamps with special cuts - 04 a

In a way, except for round stamps, most other stamps are not 'that' odd, as long as they fit into a sheet, when placed in multiple numbers on a sheet.
Triangular stamps with the longest side towards eachother, appear like square stamps.
Also diamond shaped stamps (parallellograms) fit to eachother quite nicely too.

But there are stamps that trapezoid for example, aren't that easy to combine on a sheet.
And jet ... they exist as well.

The list of examples however is not as long as with the other shapes. For obvious reasons of course.

Here some examples :
Monaco was the first to issue a trapezoid stamp

Also Malaysia got a trapezoid stamp in 1967

Malta used a trapezoid set of stamps for Christmas in that same year.

Is it a coincidence or not, but the countries that have issued trapezoid stamps, all start with an M...