The Collaborative International Dictionary of English v.0.48:

Lo \Lo\, interj. [OE. lo, low; perh. akin to E. look, v.]
   Look; see; behold; observe. "Lo, here is Christ." --Matt.
   xxiv. 23. "Lo, we turn to the Gentiles." --Acts xiii. 46.
   [1913 Webster]

The Free On-line Dictionary of Computing (19 January 2023):

LO

   Linear Objects.  A concurrent logic programming language
   based on linear logic, an extension of Horn logic with a
   new kind of OR-concurrency.

   ["LO and Behold! Concurrent Structured Processes", J. Andreoli
   et al, SIGPLAN Notices 25(10):44-56 (OOPSLA/ECOOP '90) (Oct
   1990)].