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a yield sign
The traffic sign that features both acute and obtuse angles is the yield sign. Typically shaped like an inverted triangle, its acute angles are formed at the top where the sides meet, while the obtuse angle is at the base. This design helps convey the message to drivers to yield to oncoming traffic in a clear and recognizable manner.
The term "acute" is used to describe something that is sudden, severe, or intense. It is often used in a medical context to refer to a condition or illness that has a rapid onset and a relatively short duration. Acute can also refer to the angle less than 90 degrees between two lines or surfaces.
Acute , to start with, then right, obtuse, straight and reflex.
How about 'acute' angles which are greater than 0 but less than 90 degrees.