1-1 may refer to:
*
New Year's Day, a public holiday in many countries, held annually on the first of January
*
Schweizer SGP 1-1
The Schweizer SGP 1-1 is an United States, American, homebuilt aircraft, amateur-built, single-seat, high-wing primary glider that was designed by Schweizer brothers, Ernest Schweizer and constructed by the Mercury Glider Club between 1929 and 19 ...
, an American glider design
*
World 1-1
World 1-1 is the first level of '' Super Mario Bros.'', Nintendo's 1985 platform game for the Nintendo Entertainment System. The level was designed by Shigeru Miyamoto to be a tutorial for new players, orienting them to platform jumping and to th ...
, the first level of Nintendo's ''Super Mario Bros''
See also
*
One-to-one (disambiguation)
One-to-one or one to one may refer to:
Mathematics and communication
*One-to-one function, also called an injective function
*One-to-one correspondence, also called a bijective function
*One-to-one (communication), the act of an individual comm ...
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