Originally, prior to the internet, memos were sent on actual paper, and if there was an enclosure, that means that the memo and some other document would both be enclosed in the same envelope. Now it is possible to send an attachment with an email, and call it an enclosure if you want to, although nothing is enclosed in the original sense of the word.
enclosure
Here are your plans (see enclosure). The screens on the porch create a pleasant enclosure.
a sentence using the word enclosure is: As you can see, the entire deck is protected inside the enclosure.
This is bullcrap i tell you what -Hank Hill
to tell the bank what the check is for
You answered yourself. It is called a memo spike. See link
The enclosure line of a memorandum typically begins at the left margin, following the closing of the memo, which is usually "Sincerely" or "Best regards." It should be labeled as "Enclosure" or "Enclosures" followed by a colon, and then list the documents enclosed. If there are multiple enclosures, you may number them or list them in bullet points for clarity.
You tell me
An electronic enclosure is generally plastic, and is a protective casing. These are used for various electronic appliances.
The letter said, "see enclosure", which was a form I needed to sign.Pigs are kept in a separate enclosure.A baby gate makes a room into an enclosure for toddlers.
in an examination they asked to write my ssc memo no ,so pl expalin is it hall no or any other else
Memo (a contraction of memorandum) is a noun. Nouns do not have tenses. "Memo will a associated with a verb (I wrote a memo) which may show the tense. In modern "business-speak", it is increasingly common to find people using nouns as verbs. Such as "will you memo me?". So presumably you would also get "I memoed him yesterday". See the related link.