E.T. is an abbreviation for extra-terrestrial.
Depending on context, ET can mean endotracheal, essential thrombocytosis, or essential tremor.
"Et al" means "and others" in latin.
The abbreviation for et-cetera is etc.
Et al. is the abbreviation for the Latin phrase et alii which literally means "and the others".
Irt is a Latin abbrevation: et cetera -meaning and so on.
If it is CT et al, it means CT and others. This is a Latin abbreviation.
The Latin phrase is "et cetera," and the abbreviation is "etc." Some people mispronounce this as "excetera" but it really begins with "et."
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etc.
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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.
Et al. is an abbreviation for the Latin phrase et alii, which means "and others". Since al. is an abbreviation, it is properly spelled with a period/full stop.