A chelengk was a decoration of the Ottoman Empire... It wed;as a jewelled aigrette consisting of a central flower with leaves and buds, and upward-facing rays. In modern Turkish, a çelenk is a wreath or garland, a circular decoration made from flowers and leaves, usually arranged as an ornament.
A specially-made chelengk was awarded to Horatio Nelson by Sultan Selim III in honour of the Battle of the Nile in 1798. This was the first time that a chelengk was conferred on a non-Ottoman. The usual seven rays were augmented to thirteen, as described in a contemporary letter:
The Aigrette is a kind of feather; it represents a hand with thirteen fingers, which are of diamonds, and allusive to the thirteen ships taken and destroyed at Alexandria, the size that of a child's hand about six years old when open