Question: What does the Coat of Arms of Amsterdam represent on the Coat Arms of Curaçao? 
Context: The coat of arms of Hoorn is a coat of arms that has been in uses since the middle ages.  Over time it underwent some changes, the coat of arms hasn't been changed since it was acknowledged in use by the High Council of Nobility 1816.  At present day it is, in unchanged form, the coat of arms of the municipality of Hoorn.  The current municipality was formed in 1979 by merging the city of Hoorn with the villages Zwaag and Westerblokker, it was decided to use the old coat of arms as coat of arms of the new municipality. The national coat of arms of Denmark consists of three pale blue lions passant wearing crowns, accompanied by nine red lilypads (normally represented as hearts), all in a golden shield.  It is historically the coat of arms of the House of Estridsen, the dynasty which provided the Kings of Denmark between 1047 and 1412.  The current design was introduced in 1819, under Frederick VI.  Previously, there had been no distinction between the "national" and the "royal" coat of arms.  Since 1819, there has been a more complex royal coat of arms of Denmark ("kongevåben") separate from the national coat of arms ("rigsvåben"). Coat of arms of Kumanovo is actually an emblem.  Milosh Kostadinov in 1970 wrote an article on Municipal Heraldry and came to the conclusion that just seven municipalities in Socialist Republic of Macedonia used a Coat of Arms.  Kumanovos CoA was one of them.  The Coat of arms has been changes since Macedonian independence from Yugoslavia.  In 2012 Jovan Jovanovski from the Macedonian heraldic society has discrebend the current coat of arms as: Non heraldic and quazi-heraldic.  Kumaovo coat of arms is placed on a so-called Spanish shield.  On the shield there are combined: a building "Zanaetchiski dom", a statue of a woman from the Memorial Ossuary Kumanovo, a yellow Sun, the year 1519 when the name Kumanovo was found in a Turkish document, the name of the town in Cyrillic script and at the bottom a single yellow tobacco leaf all with a red background. The Coat of arms of the Department of Bolívar is the official Coat of arms of the Department of Bolívar.  The Coat of arms had been in used before 1856, but in that year the Sovereign State of Bolívar was created, and its symbols changed, The new coat of arms, would be the same as the Coat of arms of Colombia but with a red oval around it, that read “ESTADO SOBERANO DE BOLIVAR”.  In 1886 the states were suppressed and Departments created instead, the symbols were used once again but the originals were corrupted and so there are some variations on the current coat of arms, and that which was specified on the blazon. The Coat of arms of Risør was approved by King Oscar II of Norway on 18 July 1891.  It depicts a fortification protruding from the sea.  This fortification is a symbol of Holmen battery which was built in 1788 and manned during the Napoleonic wars of 1807 to 1814.  The coat of arms was approved in a very unusual way as it was first used as a decoration on the dinner menus used for the King's visit to Risør in 1891.  During the course of dinner the king approved the design by writing "Våbnet approberes Oscar 1891 18/7" (The coat of arms is approved) on one of the menus.  This was the first new approval of a Norwegian coat of arms in 150 years and the only time it happened outside state council.  The coat of arms had been in the making for quite some time and the design had been approved by the National archive of Norway (the heraldic authority) and later by the city council on 13 July.  One architect Thorsen of Christiania is credited with the idea and artist Wilhelm Krogh did the final design. The coat of arms of Romania was adopted in the Romanian Parliament on 10 September 1992 as a representative coat of arms for Romania.  It is based on the Lesser Coat of Arms of the Kingdom of Romania (used between 1922 and 1947), redesigned by Victor Dima.  As a central element it shows a golden aquila holding a cross in its beak and a mace and a sword in its claws.  It also consists of the three colors: red, yellow, and blue, which represent the colors of the national flag.  The coat of arms was augmented on 11 July 2016 to add a representation of the Steel Crown of Romania. The coat of arms of Amsterdam is the official symbol of the city of Amsterdam.  It consists of a red shield and a black pale with three silver Saint Andrew's Crosses, the Imperial Crown of Austria, two golden lions, and the motto of Amsterdam.  Several heraldic elements have their basis in the history of Amsterdam.  The crosses and the crown can be found as decorations on different locations in the city. The coat of arms of Curaçao consists of a crown that expresses the link with the Dutch royal family.  On the left side it shows a sailing boat that represents trade.  In the middle the coat of arms of Amsterdam is shown, expressing the trading bond.  On the right side stands a citrus tree. The coat of arms of Albany, New York, is the heraldic symbol representing the city of Albany, the capital of the U.S. state of New York.  The coat of arms is rarely seen by itself; it is almost always used in the city seal or on the city flag.  The current coat of arms was adopted in 1789, although prior to that it was significantly simpler, ranging from stylized lettering to a caricature of a beaver.  Included in the coat of arms are references to Albany's agricultural and fur-trading past.  It is supported by a white man and an American Indian and is crested by a sloop.  The coat of arms is meant to represent the "symbols of industry and its rewards to man and beast on land and sea". The coat of arms of Vermont is the official armorial bearings of the U.S. state of Vermont.  Most of the elements found in the coat of arms originate in the Great Seal of Vermont designed by Ira Allen.  Whereas the Great Seal of Vermont is reproduced in a single color and is reserved for embossing and authenticating state documents, the coat of arms is a more naturalistic and colorful representation of many of the same elements.  The Coat of arms of Vermont was first used in 1807 on $5 bank notes of The Vermont State Bank .  One of these notes is in the special collections of the Vermont History Center in Barre, Vermont.  Prior to the discovery of the 1807 banknotes, the earliest representation of the coat of arms of Vermont was found on an engraved 1821 state military commissions.  The exact designer is not known, but it is likely that then Secretary of State Robert Temple worked with an engraver in developing the arms.  Considerable liberties were taken in early depictions of the coat of arms.  The location of the cow and the sheaves (bundles of cereal grains) moved about the foreground, and the height of the pine tree and size of the buck's head also varied.  A state statute was approved in 1840, and modified in 1862, both attempts to codify and create more consistent representation of the arms.  The coat of arms was cast in brass to ornament uniforms of Vermont's military regiments before, and through the U.S. Civil War, when individual states raised and trained their own regiments.
Answer: expressing the trading bond