Set-Reset latch implemented with NOR gates.
This circuit is another implementation of a Set-Reset flip-flip, this time using NOR gates. Sometimes this is referred to as a “NOR Latch”. A 74LS02 is used to provide the two NOR gates required.
See the LEAP#061 SRLatch circuit for an implementation using BJTs.
Ben Eater has a great video explaining SR latch behaviour: