No in a sense the word uncommon would mean more rare in most contexts, nonstandard, you could say, unconventional, unorthodox, irregular, etc.
The boy was a nonstandard student.
we were using the nonstandard set of measurements
There is no widely-recognized definition for "fludger." It may be a made-up or uncommon term with no specific meaning.
yes
true
false
C. Tuckey has written: 'Nonstandard methods in the calculus of variations' -- subject(s): Calculus of variations, Nonstandard mathematical analysis
You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
An automatic? Assuming you are referring to transmission.
Iso means "the same".
what is a non-standard computer protocol
nonstandard and standard measurements...