4 - Wiktionary, the free dictionary

A West Arabic numeral, ultimately from Indic numerals (compare Devanagari ४ (4)), a cursive form of four lines (to represent the number four) arranged in the shape of a cross (resembling +). See 4 § Evolution of the Hindu-Arabic digit for more.

4 (prev 3, next 5)

1. The cardinal number four.
2. A digit in the decimal system of numbering, and also in octal, and hexadecimal.
3. (phonetics, often superscript) The pitch of a tone, either high or low depending on local convention (though not as high or low as 5, if '5' is also used).

   Synonyms: ˥, ˦, ˨, ˩, depending on other values

4. (phonetics, Sinosphere, often superscript) The tone number 4, typically identified with light rising yang shang (陽上). May be identified with entering ru tone (入) if the yin–yang distinction is not made.

   Synonyms: ꜃, ꜆

• Letter styles

• Lining digit 4.

• Oldstyle 4 in Fraktur script.

The following are equivalent forms as digits:

The following are only equivalent as representations of the cardinal number:

• (Arabic digits): 0 1 2 3 4 5 6 7 8 9

Other representations of 4:

• As for.

4

2. (text messaging, slang) Abbreviation of for.

   this is 4 U ― this is for you

• M4F, M4M, T4T and others in that vein

• 2
• 8
• 4-gon

⁴

1. (linguistics, superscript) Used after an isolated affix or clitic to indicate that it has four variant forms, dependent on the vowel harmony of the preceding stem or word.

This is usually used to indicate that an affix or clitic varies between using the unrounded back vowel ⟨а⟩, the rounded back vowel ⟨о⟩, the rounded front vowel ⟨ө⟩ and the unrounded front vowel ⟨э⟩.

• ²
• ³