4

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) 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) 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: ꜃, ꜆

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.

• Audio (AU)

  (file)

4

1. (text messaging, slang) abbreviation of for

   this is 4 U ― this is for you

• M4F, M4M, T4T and others in that vein

• 2
• 8