TTL may refer to:
Photography
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Through-the-lens metering, a camera feature
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Zenit TTL, an SLR film camera named for its TTL metering capability
Technology
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Time to live
Time to live (TTL) or hop limit is a mechanism which limits the lifespan or lifetime of data in a computer or network. TTL may be implemented as a counter (digital), counter or timestamp attached to or embedded in the data. Once the prescribed ev ...
, a computer data lifespan-limiting mechanism
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Transistor–transistor logic
Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors (BJTs). Its name signifies that transistors perform both the logic function (the first "transistor") and the amplifying function (the second "transistor" ...
, a family of integrated-circuit digital logic
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Differential TTL, a serial signaling standard based on TTL
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Turtle (syntax), a computer data format used in semantic web technologies
Other uses
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Taiwan Tobacco and Liquor, a state-owned manufacturer
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TTL (Time to Love)", a single by South Korean girl group T-ara and boy band Supernova
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