{[(Orange + Violet) x (Mercedonus + Magpies for a wedding)] – Ladies dancing} x (Mercedonus – Ladies dancing) = Gates of Valhalla

[(Ladies dancing x Dowgate) – Ladies dancing] x Calling birds = Gates of Valhalla

(Vibilia – Ladies dancing) x Calling birds = Gates of Valhalla

CXXXV x Calling birds = Gates of Valhalla

Gates of Valhalla = Gates of Valhalla

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{[(2+7) x (13+3)] – 9} x (13-9) = 540

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2 | Orange = second colour of the visible spectrum

3 | Three Magpies for a wedding

4 | Four calling birds (Twelve days of Christmas)

7 | Violet = seventh colour of the visible spectrum

9 | Nine Ladies dancing (Twelve days of Christmas)

13 | 13th Roman month = Mercedonus

16 | Dowgate, Alphabetically the 16th Ward of The City of London

135 | CXXXV (in Roman numerals)

144 | 144 Vibilia – asteroid

540 | 540 Gates of Valhalla

Numbers are fun.

M in the A to Z challenge.