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The Welsh term for eleven is un ar ddeg, meaning "one on ten".
ar
a, ar, ar^2 and ar^3 where a and r are constants.
( a + ar ) = a ( 1 + r )
The marking "537 AR" on a gold chain typically indicates the gold's purity and the manufacturer's or designer's identification. The "537" may refer to a specific alloy or purity level, while "AR" could represent the initials of the manufacturer or a brand. However, the exact meaning can vary by region or manufacturer, so it's best to consult with a jeweler for precise information.