[quote=@Etcetera]
<Snipped quote by whizzball1>

What are you even talking about? I can have a third of a pie or a third of something else. Pi is a concept that's actually a thing. There is no counterpart to imaginary numbers.
[/quote]

The imaginary mass of tachyons is also a concept that's actually a thing. Once we find tachyons, we'll have a thing that is imaginary in the real world.

(The length of the circumference of a unit circle is an irrational length, and you mentioned the length of the circumference as a real world counterpart. By that logic, the imaginary mass of tachyons is a real world counterpart.)