Year 1 (I) was a common year starting on Saturday or Sunday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Saturday of the proleptic Julian calendar. It is a common year starting on Monday, in the proleptic Gregorian calendar system. At the time, it was known as the Year of the Consulship of Caesar and Paullus (or, less frequently, year 754 Ab urbe condita). The denomination 1 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. It was the first year of the Christian/Common era. The preceding year is 1 BC in the widely used Julian calendar, which does not have a "year zero". The Julian calendar also is probably the first calendar that was used frequently.

In mathematics, -1 is the additive inverse of 1, that is, the number that when added to 1 gives the additive identity element, 0. It is the negative integer greater than negative two (-2) and less than 0.

+1 may refer to:

• +1 (film) (also known as Plus One), a 2013 film
• +1 (album), a 2008 album by Kaela Kimura
• +1 (song) a single by French electro and nu disco DJ Martin Solveig

1 (one; or , also called unit, unity, and (multiplicative) identity), is a number, a numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1.

1. is the ordinal form of the number one in a number of European languages.

The process of filename mangling, in computing, involves a re-writing of the file name for compatibility at the operating system level. It occurs when a filename on a filesystem appears in a form incompatible with the operating system accessing it. Such mangling occurs, for example, on computer networks when a Windows machine attempts to access a file on a Unix server and that file has a filename which includes characters not valid in Windows.

Increment or incremental may refer to:

• Incrementalism, a theory (also used in politics as a synonym for gradualism)
• Increment and decrement operators, the operators ++ and -- in computer programming
• Incremental computing
• Increment, chess term for additional time a chess player receives on each move
• Incremental games
• Increment in rounding

Onekama ( ) is a village in Manistee County in the U.S. state of Michigan. The population was 411 at the 2010 census. The village is located on the shores of Portage Lake and is surrounded by Onekama Township. The town's name is derived from "Ona-ga-maa," an Anishinaabe word which means "singing water."] Some local business people have produced sweatshirts, T-shirts, and bumper stickers with the symbols "1," (pronounced 'ONE comma'), a common mispronunciation.

In combinatorial game theory, star, written as or , is the value given to the game where both players have only the option of moving to the zero game. Star may also be denoted as the surreal form {0|0}. This game is an unconditional first-player win.

Tenth may refer to:

• 10th, the ordinal form of the number ten
• ⅒ or 1/10, a fraction, one part of a unit divided equally into ten parts. It is written 0.1 in decimal notation.
  • the SI prefix deci-
  • tithe

Unicode has subscripted and superscripted versions of a number of characters including a full set of arabic numerals. These characters allow any polynomial,  chemical and certain other equations to be represented in plain text without using any form of markup like HTML or TeX.