- Fungsi (matematika)
- Hamengkubuwana X
- Windows 3.x
- X Factor Indonesia (musim 3)
- X (media sosial)
- Komposisi fungsi
- MacOS
- Panggil Namaku Tiga Kali
- Akar kuadrat
- Integral lipat
- Windows 3.x
- X-Men: The Last Stand
- Centaurus X-3
- List of X-3 flights
- 9.3×62mm
- 3 (The X-Files)
- USB 3.0
- Sonic the Hedgehog 3 (film)
- 9.3×64mm Brenneke
- Natural logarithm
