11/Historical Note

Historical Note on $11$ (Eleven)
Some of the archaic imperial units of length appear as divisors and multiples of other such units, for example:


 * $4$ rods, poles or perches equal $22$ yards equal $1$ chain


 * $220 = 11 \times 20$ yards equal $1$ furlong


 * $1760 = 11 \times 160$ yards equal $1$ mile.