TTL

• Through-the-lens metering, a camera feature
• Zenit TTL, an SLR film camera named for its TTL metering capability

• Time to live, a computer data lifespan-limiting mechanism
• Transistor–transistor logic, a family of integrated-circuit digital logic
• Differential TTL, a serial signaling standard based on TTL
• Turtle (syntax), a computer data format used in semantic web technologies

• Taiwan Tobacco and Liquor, a state-owned manufacturer
• "TTL (Time to Love)", a single by South Korean girl group T-ara and boy band Supernova

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