G&T meaning in General ?

A gin and tonic is a highball cocktail made with gin and tonic water poured over a large amount of ice. The ratio of gin to tonic varies according to taste, strength of the gin, other drink mixers being added, etc., with most recipes calling for a ratio between 1:1 and 1:3. It is usually garnished with a slice or wedge of lime. To preserve effervescence, the tonic can be poured down a bar spoon. The ice cools the gin, dulling the effect of the alcohol in the mouth and making the drink more pleasant and refreshing to taste.

In some countries (e.g. UK), gin and tonic is also marketed pre-mixed in single-serving cans. In the United States, most bars use "soda out of a gun that in no way, shape, or form resembles quinine water", according to bartender Dale DeGroff. To get a real gin and tonic, DeGroff recommends specifying bottled tonic. Alternatively, one can add tonic syrup to soda water.

It is commonly referred to as a G and T in the UK, US, Canada, Australia, New Zealand and Ireland. In some parts of the world, it is called a gin tonic (e.g. in Germany, Italy, France, Japan ( ジン・トニック, phonetically "jin tonikku"), the Netherlands, Spain, Turkey). It is also referred to as "ginto" in Belgium and the Netherlands, and "GT" in Scandinavia.