| Acronym | Definition |
|---|
| ZTT➣Zero to Three (National Center for Infants, Toddlers and Families) |
| ZTT➣Zirconium Tin Titanate (ceramics) |
| ZTT➣Zang Tuum Tumb Records (record label; UK) |
| ZTT➣Zero Transfer Time (Uninterruptible Power Supply systems) |
| ZTT➣Zinc Tolerance Test (biological research) |