to

(redirected from to and fro)
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(electricity)

to

(networking)
The country code for Tonga.

Heavily used for vanity domains because it looks like the English word "to".
References in classic literature ?
To and fro in the seven chambers there stalked, in fact, a multitude of dreams.
At every jump of the schooner, red-cap slipped to and fro, but--what was ghastly to behold--neither his attitude nor his fixed teeth-disclosing grin was anyway disturbed by this rough usage.
"Once in the middle of each week a Law of Nature compels us to move to and fro with a rhythmic motion of more than usual violence, which continues for the time you would take to count a hundred and one.
While Grandfather walked to and fro across the room, the imaginative boy was gazing at the historic chair.
The nest swayed to and fro, as they sat on the rim and cried.