A certified letter should be written just as any other business letter, but you should note above the name and address of the person to whom it is addressed "Sent Certified Mail, Article No. ***********" The Article Number should correspond to the Certified Mail Receipt form (PS Form 3800) from the USPS. This means that you should pick up the form from the Post Office before you print your letter, so that the article number can be printed, rather than hand-written in.
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article 7073
A double-sharp resembles a small letter "x."
Alpha symbol is the letter a.Greek letter alpha can't be displayed here. See link below.
The Roman numeral 6 is represented by the letter "VI" in the Roman numeral system.
In most junior school work it will look like the letter x. Computers, though, use the asterisk (star) symbol, *. In college or university mathematics you are more likely to use the full stop: as in a.b