Definition of "langle" [langle]

• To saunter slowly.

The Century Dictionary (Public Domain)

• "$M$ on input $\langle M\rangle, x$, for every $x$ long enough, leads to a contradiction."
• "We could try the same with NP, and define $L$ to contain pairs $ (\langle T\rangle, x) $ such that $T$ is a non-deterministic Turing machine that has no accepting path of length $\leq"
• "\psi ({\vec r}, ~t) ~ = ~\langle {\vec r} | \psi (t) \rangle, here nonrelativistic, which obeys wave equations."