etc
You spell it: Et cetera :)
His power is water, the sea (ocean) rivers et cetra.
The structure of buildings, mathematics, et cetra.
The abbreviation for et-cetera is etc.
Cetra Records was created in 1933.
Cetra Records ended in 1957.
Quartetto Cetra was created in 1941.
La Cetra - Vivaldi - was created in 1727.
E.T. is an abbreviation for extra-terrestrial.
The Latin phrase is "et cetera," and the abbreviation is "etc." Some people mispronounce this as "excetera" but it really begins with "et."
In Latin, "et al." (short for "et alii," meaning "and others") should indeed have a period after it, as it is an abbreviation. However, "et ano" is not a standard Latin abbreviation and does not typically require a period. If you meant "et al." or another specific abbreviation, it would depend on the context in which it is used.
etc.