The Brix scale (symbol °Bx) is a standardized system used to measure the mass fraction of sucrose in an aqueous solution. In the beverage industry, one degree Brix (1°Bx) represents 1 gram of sucrose per 100 grams of total solution. Essentially, it is a measurement of percent by mass.
Saline solution is a simple mix of salt (sodium chloride) and water. In beverage work, it is commonly prepared at about 18–22% salt by weight, because that strength lets you use it drop by drop to enhance flavor without making the drink taste obviously salty.
Acacia honey is one of the most useful “quiet” sweeteners behind a modern bar. It sweetens without taking over, which is exactly what you want when working with delicate botanicals like gin, light florals, or subtle citrus builds.