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Trilby degree

Jaunty Angle Halfdropped cartoon
Pythagoras favoured a tainia

The mathematical symbol for a unit vector is called a hat. So if the hat above was a unit vector*, it would be called hat hat. If it was raining, the hat hat might wear a hat hat hat. This is known as a hat trick.
Next week: fashionably late and the space-time continuum.
*A unit vector is something that goes in a certain direction and has a size of one. This hat is going at an angle, but I think it’s a medium, so it’s probably not a unit vector. Might be a stockman.