The meaning of the Acronym 1 is...

1 is

• SOH ( Start of Header)

More Meanings For 1:

• Fax (Hayes JT FAX) (many)
• Unformatted manual page (Roff/nroff/troff/groff)
• SOH ( Start of Header)
• United States

1 is also in:

• ASCII Character Codes
• File Extensions
• Telephone Country Codes