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 ?
But Darzee had built it out of reach of snakes, and it only swayed to and fro.
That night at dinner, walking to and fro among the wine-glasses on the table, he might have stuffed himself three times over with nice things.
Little by little the scene on the quay became more animated; sailors of various nations, merchants, ship-brokers, porters, fellahs, bustled to and fro as if the steamer were immediately expected.
Sweet words falter to and fro -- Though the great River rolls between.
A reader of words of wind-demons might have been able to see the portions of a dialogue pass to and fro between the exhorter and his hearers.