PL-1 or PL1 may refer to:
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PL/I
PL/I (Programming Language One, pronounced and sometimes written PL/1) is a procedural, imperative computer programming language developed and published by IBM. It is designed for scientific, engineering, business and system programming. I ...
, a programming language
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Lamson PL-1 Quark, a glider
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Pazmany PL-1
The Pazmany PL-1 Laminar and Pazmany PL-2 are American two-seat trainer and personal light aircraft designed by Ladislao Pazmany to be marketed as a homebuilt aircraft by his company Pazmany Aircraft Corporation. The aircraft was built under lic ...
, a trainer aircraft
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K-5 (missile)
The Kaliningrad K-5 (NATO reporting name AA-1 ''Alkali''), also known as RS-1U or product ShM, was an early Soviet air-to-air missile.
History
The development of the K-5 began in 1951. The first test firings were in 1953. It was tested (but n ...
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