These lines are perpendicular: _|
Nothing. A perpendicular is an adjective, not a noun. A perpendicular, by itself, cannot exist. A perpendicular bisector, for example, does not have any sides.
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Vertical
A perpendicular bisector has a right angle or 90 degrees
Perpendicular is when two lines cross and form a right angle, which I hope you know what that is.
They look like an upside-down "T".
As far as we know, two lines can be perpendicular, or they can be parallel, but they can't be both.
Look up Tesseract.
Yes. Take a look at the corner of your room, where two walls meet the floor.
it would look weird because that is not possible
They intersect at 90 degrees