TO

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TO

The two-character ISO 3166 country code for TONGA.

TO

1. ISO 3166-1 alpha-2 code for the Kingdom of Tonga. This is the code used in international transactions to and from Tongan bank accounts.

2. ISO 3166-2 geocode for Tonga. This is used as an international standard for shipping to Tonga. Each division has its own code with the prefix "TO." For example, the code for 'Eua is ISO 3166-2:TO-01.
References in classic literature ?
When he had lifted one-third of himself clear of the ground, he stayed balancing to and fro exactly as a dandelion tuft balances in the wind, and he looked at Rikki-tikki with the wicked snake's eyes that never change their expression, whatever the snake may be thinking of.
One was the British consul at Suez, who, despite the prophecies of the English Government, and the unfavourable predictions of Stephenson, was in the habit of seeing, from his office window, English ships daily passing to and fro on the great canal, by which the old roundabout route from England to India by the Cape of Good Hope was abridged by at least a half.
And strange, too, it is to stand on Primrose Hill, as I did but a day before writing this last chapter, to see the great province of houses, dim and blue through the haze of the smoke and mist, vanishing at last into the vague lower sky, to see the people walking to and fro among the flower beds on the hill, to see the sight-seers about the Mar- tian machine that stands there still, to hear the tumult of playing children, and to recall the time when I saw it all bright and clear-cut, hard and silent, under the dawn of that last great day.
Sweet words falter to and fro -- Though the great River rolls between.