SM4
SM4, Sm4, sM4 or sm4 may refer to:
- VR Class Sm4, a type of train operated by the VR Group
- SM4, a part of the SM postcode area, in Sutton, England
- HST-SM4, the final servicing mission to the Hubble Space Telescope
- SM4 (cipher) (formerly SMS4), a block cipher used in the Chinese National Standard
- RGM-165 LASM, also designated as SM-4, missile covered by the RIM-66 Standard
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