From The Free On-line Dictionary of Computing (19 January 2023):
Strand
1. AND-parallel logic programming language. Essentially
flat Parlog83 with sequential-and and sequential-or
eliminated.
["Strand: New Concepts on Parallel Programming", Ian Foster et
al, P-H 1990]. Strand88 is a commercial implementation.
2. A query language, implemented on top of INGRES (an
RDBMS). ["Modelling Summary Data", R. Johnson, Proc ACM
SIGMOD Conf 1981].