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1 - Wikipedia
1 (one, unit, unity) is a number, numeral, and grapheme. It is the first and smallest positive integer of the infinite sequence of natural numbers.

I Can Show the Number 1 in Many Ways - YouTube
Learn the different ways number 1 can be represented. See the number one on a number line, five frame, ten frame, numeral, word, dice, dominoes, tally mark, fingers and picture representations.

1 - Wikiwand
The number 1 is the first natural number after 0. Each natural number, including 1, is constructed by succession, that is, by adding 1 to the previous natural number.

1 is NOT Prime - Numberphile - YouTube
Is 1 a prime number? Apparently not. Dr James Grime explains.

1 (number) - New World Encyclopedia
The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line, as is still the case in Chinese script.

1 (number) - Simple English Wikipedia, the free encyclopedia
1 (number) ... Chinese hand sign 0:01 Pronunciation of the number 1. One (1) is the first natural number, followed by two, then followed by three. The Roman numeral for one is I. Babylonian number 1

Why Is There A +1 In Front Of Phone Numbers? – Quick Guide
The “+1” prefix in front of phone numbers indicates the country code for the United States and Canada. When dialing internationally, each country is identified by a unique code.

1 | NumbersWiki | Fandom
The number 1 is the first natural number after 0. Each natural number, including 1, is constructed by succession, that is, by adding 1 to the previous natural number.

1 (number) | Math Wiki | Fandom
1 is the natural number following 0 and preceding 2, the Hindu-Arabic numeral for the number one (the unit). It is the smallest positive integer, and smallest natural number. 1 is the multiplicative identity, i.e. any number multiplied by 1 equals itself, for example: a ⋅ 1 = a {\displaystyle a...

Difference between :: and ::1 - Network Engineering Stack Exchange
However, I would nitpick that loopback in IPv4 is a complete /8 network, 127.0.0.0/8, including the well-known address 127.0.0.1, whereas it's only the single address ::1 in IPv6.