an accessory object
appurtenance - accessory
The formal word ‘appurtenance’ refers to something that is considered to be a secondary or less significant part of something more important. By extension, the term can also express a piece of property regarded as an accessory to a certain lifestyle. Most commonly used in its plural form.
Despite his success, the businessman eschewed many of the appurtenances of wealth such as luxury cars and watches.
I told the staff to let me know if they lack an appurtenance needed to perform their task rather than try to improvise.
Whenever I go abroad on business, I am meticulous about packing travelling appurtenances such as a plug adaptor and ergonomic pillow for the flight.